I don't think there's a one build beats all build. There are many Archer builds that are very powerful.
I like Mages myself, zero cost destruction spamming Impacting Fireballs (for old school fun) or whatever... Works well for me. Stealth builds, as powerful as they can be are boring. It just doesn't click with what I roleplay.
There are some downsides to bound bows. You can't cast any other spell or use any other weapon while holding the bow. Casting the spell makes noise, which can alert an enemy. If you take the soul-trapping perk (necessary to get the summon-banishing perk), your bow will automatically trap any low-level thing you kill, so you wind up with a lot of petty souls in high-level gems. And you can't cast the spell while on horseback.
What is this about bound bows causing file bloat? As for the soul gems there is a mod that prevents small souls from filling a larger gem.
Anything that involves restoration, smithing, enchanting, heavy armor, block, one-handed and the defensive perks in the Alteration skill-tree. Between the base-stats of the equipment, what you can temper it to be and that you'll never die because you can just heal for 0 magic, you are effectively immortal. Whether you go Atronach or Lord standing sttone really is a matter of personal preference at this point.
The arrows from the Bound Bow either don't despawn until the area they're in resets or they never despawn (I forgot which). Basically, if you miss a lot with BB you're going to have a ton of arrows lying around that you can't pick up or get rid of.
This is not correct for the vanilla game. If you conjure a bound bow and activate your horse to mount, you will shoulder the bow which causes it to dispel. In other words, you much 'sheath' your weapon before mounting, and sheathing a bound weapon dispels it. My elven horse archer can use a bound bow from the saddle but only via mods.
If you like elemental damage weapons, take a look at what you can do with the elemental Destruction perks combined with a filled Enchanting tree.
A. No, as Acadian points out. You can't use a bound bow on horseback, except with mods.
B. Many character types would find trapping black souls to be abhorrent. It's fine for necromancers.
I also question some of your "math." A spell like Chain Lightning, cast in a room full of enemies, is far more effective than a bow.
I have to wonder how much in-game experience you are working from. A bound bow is pretty useless against any large group of melee enemies. You are going to be rushed and overwhelmed.
I don't play the vanilla game, so this discussion does not really apply to me. Requiem balances out sneak by removing the sneak damage multiplier from undead, daedra and dwemer automatons, vastly increasing the protection armor provides against arrows (and increases the amount of AR many enemies have), adding rapid health regeneration to certain enemies, such as dragon priests, spriggans, trolls, enchanted dwemer spheres, etc. With my mod setup, a sneak archer is probably the least powerful build, easily outclassed by a destruction mage (Requiem completely changes vanilla magic) or a 2H warrior, and requiring enchanted arrows to defeat many high level enemies.
My recollection of vanilla was it was pretty easy to become overpowered with any build.
Max smithing, enchanting, and alchemy and every combat build is OP.
How can it be a game breaking exploit when it easily doable by normal in-game actions? It's not as if I said use the restoration loop.
Pretty much.
How is using the normal game assets an "exploit"?
Here's the thing. If you play in a certain way, you perfect that style. Then, if you try something else, it seems weak by comparison, because you're not as adept at is as you are with your "favorite" style. The result is that one can think that a certain way is "better."
The fact that you didn't know about the inability to use a bound bow on horseback is proof that you don't know the vanilla game as well as you think you do.
Edit: Also, in thinking about it, I'd say that your sneaking vampire example is pretty close to being an "exploit" in itself. Sneak is definitely already overpowered in Skyrim, and you are compounding it with the vampire. The bound bow is almost immaterial.
Forgive me for asking what may seem to be a pointless question, Roachor
You have come to a forum intended for (and populated by) fans of Skyrim. The purpose of this forum is for individuals to converse with others and thereby enrich each others' enjoyment of the game and understanding of lore as well as provide a safe space to express a level or method of enjoyment which would perhaps be less well accepted in many places.
If one accepts that to create a topic here is to invite differing opinions, then I have to wonder what is the point to your topic if you are unwilling to accept these differences of opinion?
I am trying to be as inoffensive as possible, but to refute other opinions with "sloppy game design" (direct quote) and "i only made a mistake because I haven't played the game in 27 months" (paraphrasing, not directly quoting, of course) is about as immature as one can appear online without resorting to name calling.
So, are you willing to accept other peoples' opinions or should we accept this as a troll topic hoping to rile up fans of a game you haven't played since november 2013? (release date of the xbox one, which you yourself stated as the point you ceased to play skyrim)
To be clear, horse archery works fine. It is bound weapons that dispel upon mounting a horse. So, as we said, it is not possible without mods to use a bound bow from a horse.
As far as fighting regularly from the saddle, my elf does exactly that - and only with a bow (she will not touch melee weapons). If not inside a dungeon or building, she is generally in the saddle. Thanks to mods, she even rides inside the walled cities. It is certainly the only way she travels the wilderness. She does use a critter 'follower' as a distraction to help her keep her distance. Horse archery in Skyrim is a challenging artform that takes a lot of effort and patience to become good with. The key is having some sort of follower/distraction to help keep foes at a distance.