In COH1 maybe because of my cpu/gpu being amd and not nvidia, all sfx for example explosion, gunshots would show a pink box outline that glitches, the young me at that time didn't mind lol since I've completed the game on my brother's PC.
But a worse case is me trying to play an old game but its unplayable because all of its visual is black and it effects only amd users...
I even tried playing my childhood game Empire Earth 3, its very buggy visually, crashes upon completing campaign and is laggy.
I guess I could get a refurbished Thinkpad laptop since I heard its like brick that I can throw to someone just like Nokia and its cheap and reliable~
Not sure about armour (arrows can be designed specifically to work against chainmail, but afaik not against plate) but shields are good against pierce - which is another way to make units differents.