Just some thoughts on what I read, if the translation is accurate (not that I do not trust the fellows in this forum):
If you remove the shield requirement entirely anyone will be able to pick up a shield. ANYONE. Imagine a 2 hander chasing around a thrower like myself, or an archer, or a crossbower. Now imagine the guy, instead of having to rely on messing my aim by going back and forth and zig-zagging like crazy, could just pick up a shield on the ground (from a mess of bodies on the floor, which usually happens in clusterfucks). He could block anything I threw at him and almost any bolt or arrow depending on the shape of the sield.
Using a shield takes skill in real life and there are techniques on holding a shield and reflecting blows. If you give a random person a shield against a somewhat skilled swordsman he will be able to ignore the shield with ease. Of course Warband doesn't go that much in depth, but if you allow anyone to use a shield 2 handers and the like, and throwers will be able to survive for much longer than they should. I'm only able to take them out because they can't do anything to block my projectiles while they are running around the map, but if you leave me in a 1 on 1 against a guy who can negate my usefulness entirely I will be incredibly handicapped. Even if you add the "your shield will be slow". It already feels quite broken and stupid in native, at least in my opinion; seeing a guy with a long bardiche pick up a heavy round shield till he gets into melee without any penalties (other than slow movement, but honestly, he can drop the shield at any given time once the ranger runs out of ammo or is too close). I can just imagine all the archers carrying shields too *shivers*.
If you make horses hard to turn and you expect cavalry to work together you'll be soon shocked to realize that no one is working as cav properly. Coordinating attacks as a cavalryman is almost impossible because you can't predict where enemies will be (unless you use ts, which is unlikely) and how they will react to your charges. Most aware footmen will be able to counter you. I agree that the way some horses like the desert horse turn is ridicolous but they are also pretty easy to take down with ranged and throwing weapons (trust me, I main throwing
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). While I do agree with you that a coordinated cavalry charge would be nice to see it's just not possible with the blocks of spears, 2 handers and the like that roam around the map. Cavs are supposed to taken on unaware or vulnerable players most of the times. I know you are talking exclusively about horse archery, but this would heavily affect pole cav. and 1 hander cav. I do think horse archery is ridicolous in this game, however. They are annoying, they don't need much effort to get points and they always seem to delay the game a lot.
I doubt you'll be able to understand this whole wall of text but I hope someone is able to translate a part of it. This is just my opinion, so please don't take it harshly.
PS: Your signature is cute ^^