Right.
Now replay and make him a dual-wielding Nord with enchanting and armor. The new character will curbstomp your old one; dual-wielding almost completely invalidates two-handed as an option because it provides you with a guarenteed stagger from power attacks while dealing out superior damage per second. The ONLY advantage Two-handed has over dual wielding is that you can block, which is rendered ridiculously minor when you consider dual-wielding doesn't NEED to block because it can stagger-lock opponents. Yes, you can stagger lock because again, Skyrim's brilliant core system design only requires you to have ONE stamina to use a power attack. FFS, you don't even need to MIX potions; just mass farm ingredients that give stamina (any amount) and you're set to spam the power attacks as much as neccesary.
I never said the weaker ones weren't doable, I simply said they have no chance in hell of competing with the stronger ones. It's a special kind of frustrating to make your first character a dual-wielder, then to want to replay as a two-hander, only to realize that a two-handed is nothing but a severely gimped dual-wielder.
Again: name ONE RPG game that prevents you from gimping yourself and making yourself weak.
There isn't one, because any RPG under the sun can be made difficult by simply taking your armor off. If you truly want to be weak, you can do so with ANY system.
The problem with Skyrim's is that it accomidates for the weak to make them viable options, the result being that the strong literally cannot die unless the player has a stroke at their keyboard. The % damage reduction only polarizes weak and strong, and if they'd develop a system that were more flexible, then BOTH weak and strong could be viable while offering more challenge for the strong while still making weak builds possible.
Take Dark Souls for example. You can get the best armor in the game defense-wise and you truly notice you're wearing it because you take less damage. You can then use the best Greatshield in the game and block attacks that no other build in the game is capable of blocking. On the flip side? You can run around naked with a tiny parry shield. Yes, you take more damage, but the damage gap isn't SOOOOOOO huge that the heavy armor guy isn't taking any damage while the naked guy is being one-shot; the heavy armor guy is probably, at MOST, taking 60% less damage. The naked guy however moves much faster, can dodge and roll for less stamina cost and while his shield isn't good for blocking, it DOES parry better, so a skilled player can still utilize this character in such a way that it's viable and dangerous. If he's unskilled though, yes, he'll probably prefer just wearing his armor and blocking.
Take New Vegas. Yes, armor helps. You will find Old World Blues much easier and MUCH cheaper to navigate if you use power armor instead of light armor. However, power armor is not the end-all, do-all. Infact, both light armor and power armor are susceptible to headshot criticals from AMR's being instantly fatal on very hard difficulty: the damage it deals is much too strong for your armor to matter. Ironically, Light armor specializes in crit and dodging crits, so with the right perk, the light armor character has a better chance of walking away from that headshot alive because the headshot is far less likely to critical at all vs. Light armor. But yes, in standard gameplay, you'll notice power armor being more comfortable and less costly in typical fights because it takes less damage on average, whereas light armor is gonna make the standard fight more difficult for you, BUT when you DO fight that enemy that's really dangerous and scary, he probably won't oneshot you like he might on the power-armored player.
Both of these systems offer up an armor system (New Vegas does direct subtraction from incoming damage instead of % reduction, meaning you eventually become god-like vs. weaker enemies and small firearms, but major enemies are STILL threatening; running around naked only means the minor enemies remain somewhat threatening) or range of defense (not capping at 80%, but rather ~50% and the trade-off of moving much slower; in this sense, the best armor is definitely nice to have, but NOT wearing it isn't suicidal, and there's a plan B via movement speed and dodging in place for if you opt out of wearing it) that allows for both the "weak" and "strong" builds to be completely viable and "strong" in their own unique way. This promotes diversity in playstyle and gives you a reason to try out that new build: because it truly plays different.
Skyrim does not promote diversity. Ebony curbstomps iron, Glass curbstomps leather. Using either iron or leather does nothing to change the core gameplay mechanics or style, but rather just makes you die more. You want to experience everything? Make an overpowered character, take your armor off if you feel like being weak. Wanna be strong? Put it back on. And if you're a masochist, work your butt off trying to find "the right balance" in a system that Bethesda themselves should've bothered to balance for you.
Two-handed is not "different" from dual-wielding anymore than scrubbing the floor with a toothbrush is "different" than scrubbing the floor with an actual cleaning brush. There's no "freedom" to being able to scrub the floor with a toothbrush instead, but there is freedom to being offered an alternative to scrubbing the floor that you can choose to take at any time.
Why?
Why would you want to be a moderately skilled swordsman if it plays EXACTLY the same as a skilled or un-skilled swordsman, cept the damage is slightly less/more.
That's part of my point: your idea of "diversity" is the ability to determine how much your character svcks. My idea of "diversity" is being given multiple, viable options on how to play my character. I want multiple combat styles that are equal in strengths and weaknesses, but all Skyrim offers is "dual-wielding, sword and board or stealth if you wanna rock, destruction magic or two-handed if you're a masochist."
That's not diversity, especially not if you play the strong character types before experiencing the weaker ones.
Finally, finding a middle ground simply isn't realistic. There's going to be a point where your character is either frustratingly strong or frustratingly weak. There's going to be a point where you ask yourself why you're bothering to swing your sword 60 times when you could just spend your perks and only have to swing it 10 (of course assuming you're not needing those perks elsewhere). There's going to be a point where 80% of enemies die at the exact same speed they die regardless of if you took 2 of those perks or all 5.
But in short, I don't see how different levels of damage = totally different characters to you.