Just sat down and read the whole thread. Most of the stuff is true. Over all this is a very good basic over view of certain things many people over look concerning the combat aspect of writing, or combat in general. The internet is full of "i'd be a hero" complexes from bored kids. My biggest criticism of this would be that the over look of it all is superficial. And this isn't an insult to the writer but simply said, you can read books and books upon the topic but until you learn and feel for yourself how to do it, you don't actually know how to do it regardless of how well it is explained. I'd like to make some comments of my own that also (as any written work) falls under this criticism.
Concerning blocking, you never want to use your force to be an equal and opposite counter to your enemy's force. Deflecting is always best and is attained by proper structure which allows proper and efficient body rotation. Sticking your sword or shield out to just hold it will get you a broken arm since all the force is pushed into you. If the enemy has enough time and room to make a powerful blow you should have enough time easily to gain your proper structure.
Concerning the sword and dagger, in the balkans and caucus mountains it was very popular to fight with a long saber/sword and a shorter saber. The interesting aspect (most noted in my studies from the Serbs of Montenegro) was that you could use the shorter blade by itself as a normal saber but when using the longer sister blade you would use the shorter one as a hook. As for using a dagger and sword being something more skilled swordmen would used compared to a shield and sword, i'd have to disagree. In a 1v1 setting this may be true, but on a battle field the shield is extremely important were the fighting is much more compact.
I really liked the part concerning the plate armor. I can't tell you how many times I see people writing about armies where everyone is armed and armored in heavy plated armor. The "low quality troops have iron and steel armor" because their armor value is based on TES where iron is the lowest of the heavy armors and chain mail is light armor. At the same time I must disagree that the hardest armors were always worn by the richest. Maybe this is true in western europe but in eastern europe and the middle east, lammelar and scale armors were very popular. The east Roman armor (Byzantine, what an ahistorical term) was known to be just as good and more versatile than the western plate armor because it blended deflection and absorption. But in any case i still have to agree that most troops would not have plate armor. Most would have padded cloth, some leather, and maybe an iron helmet if they were good. I'd also like to add that plate suits of armor did NOT turn the warrior into a clumsy stumbling mass of metal. I've seen writers who talk about the lone skilled warrior of the katana dispatching of the clumsy slow plate armored knight due to this and it's non sense.
About shields, I wouldn't say that large shields are only good against spears and get in the way of anything else. Again I think your statement is based on perhaps focusing slightly too much on a micro aspect of battle rather than a macro aspect. If large shields were a hindrance they wouldn't have been used for such a long time by the Romans. And I am speaking of the Romans during the whole span of the Roman Empire not just until 467. The skoutati for example were armed with spear, spatha and saber depending on what they needed to use and still maintained a large oval shield. I would however like to add that regardless of what people have seen in OB and MW...there is no such thing as a "steel shield." In that shields of that mass made of solid metal are impossible. The only shields like that were usually much smaller and held close to the body. Most shields were composed of wood, wrapped in leather and maybe had a coat of metal on the surface. Another interesting aspect of the shield is that it would sometimes be given soft edges on purpose in order to get the enemy weapon stuck in the shield.
Concerning slings...while accuracy is important to an extent you don't really need to be all that accurate when fighting in an army v army situation. You just need to make sure your stone hits the mass of men in front of you. You don't need to take time to aim individually at the target. This goes also for archery. If you play the lone assassin, yes you need accuracy. But against a clump of men not so much. What is more important is rate of fire, endurance and positioning.
Concerning fighting a spear, this is where a shield comes in handy. In massed groups you can push through the spears and get so close to the enemy that they can't do much of anything against you.
Now about the mind of the warrior I have to say that we can not make so many assumptions as the mind is a very varied thing. I would like to point out however that the good fighters mostly weren't the "scholar warriors" that people read about in books and what not, but thugs who had to learn how to fight in order to survive. Wuxia is highly guilty of such a non sense stereo type of the serene mind as clear as a motionless lake types which is furthered by popular movies. None the less it must be understood that a certain 'killing instinct' must be maintained in order to be effective. This is something most people, even those on the battlefield often don't have. It isn't rage or fury or anything like that but something else explosive. Rage and fury have their uses to a extent however.
As for the best warriors being those who don't think they will come out alive as claimed by someone else here that can be the case sometimes. Other times it is especially those who do want to live that fight better. Just depends.
Foxy have you ever read the Strategikon of Emperor Maurice? I liken it to Sun Tzu's art of war but much more practical and with a soul. Sun Tzu comes off more vague and basic, things like don't pee in the wind, don't crap were you eat etc. Where as Maurice goes into much greater detail in not making the unit sizes uniform confusing the enemy, on the field tactical maneuvering, methods of training and discipline and so on.
Psychological warfare is usually only used in Modern combat. I mean, there are propaganda and scandals back home during these times to boost the citizen's morale, but that's about it. Realistically Psychological warfare/propaganda weren't widely use until the Napoleonic era. Now, Alexander did march on many cities with a large force in an attempt to get them to surrender, but that's very, very basic psychological warfare.
Really, the Nazis perfected it.
One only need to look as far back as the 1400s Voivode of Wallachia Vlad Dracula to see that this isn't true or even Stefan Cel Mare or Mihai Viteazul.