AV Backdoor exploit now common in the majority of games?

You mean the morale issue?

Well, as mentioned already:

If bots could play as unpredictably as players do, then it wouldn’t make a difference to people who they face in BGs, whether it be bots or actual players.
This is a bad thing. It’s a social design issue not being suitable for the game design.

Basically it affects your immersion in a negative way.

^ You can read more about it in this thread.

Then you have things like:

^ Which is kinda related to the same psychological effect.