I support controller mapping.
I think that's it's a ludicrous statement to say it makes glitches more possible(unless it's very badly coded) to find. BXB and the like are in game glitches dealing with interrupting animations and resetting game mechanics, and have nothing to do with button placement.
It is no different than switching controls now, as far as exploits go. Aside from being able to map the used buttons closer together, it's no "aid" for bxb users.
Almost all PC games have it now a days, hell, they did ten years ago for most games.