The AA MAXes used to be ok-ish effective against lone infantrymen in PS1, if you had an AV weapon equipped you usually came out on top.
The pounder AV on the other hand only managed to kill infantry by volume of fire
I can't remember this being imbalanced back then, so I doubt they'll change much about it. Also, I don't think it's fun to run around in an expensive/timer-locked MAX suit with zero efficiency against the most common opponent. AV/AA should at least hurt enough to discourage infantry from engaging head-on IMO.
edit: typo fixed