I thought AUS server died from lack of players? If I'm wrong I'm sorry, but I havent seen it in ages in the server list... and if I am right and its gone: WTF are you posting for Frank? The input of someone with 200+ ping is hardly valid or needed.
But treating your post as legitimate:
Blind HA is actually a very difficult class to play with any level of success and it requires huge quantities of battle field awareness, not less. With archery I just keep myself near the blob of infantry and then make sure I've not got cav flying up my arse, it's pretty bloody easy.
Wiith HA you have to be constantly aware of the position of everyone on the field all the time. If you come into melee contact with infantry, your dead, same goes for cav. If you come into contact with range you or your horse are dead unless they are terrible. You have a limited number of legitimate targets and everything can kill you if it gets with in range of you often in one or two hits. On top of that targeting requires a lot of concentration and once you do that you instantly loose focus on what's going on around you.
First: I dont see how coming into contact with enemy infantry or cavalry doesn't end with foot archers dyingng, unless of course they are gods in melee. But what would I know, only played 16 gens as archers, and 10 as horse archer, I cannot really say for sure...
I never had a problem keeping focus as HA: focus was to stay alive and shoot everyone you see in the head, the horse, or bump them down and shoot them in the head after that. But again, I played M&B since it became shareware/trialware in 2004 I believe, and full game cost £4... I have rode around shooting stuff for 10 years now.... crazy.
EDIT: on a sidenote, bow balance is still retarded, theres no reason to use the top tier bows except style at the moment, since for reason the fucking joke bows from the east actually do damage to armour, despite their being pretty much toys by the 15th century.