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~

Probably to make you build more ships for naval battles. 

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.

Why has this been removed ?

I'm actually one of the first who understood what you're trying to introduce to the game. That's why I've reacted the way I did. I'm sure the developers understood, as well. Your incoherent, strawman analogies and personal insults have prolonged the discussion and pushed it on to a different path.  It's good that you're acknowledging this. There's nothing more to add, honestly.