@Prof3ss0r_M1k3More simply put, 1 human brain going solo against a team of 32 AI plays much differently than 32 human brains going up against an opposing team of 32 more human brains. The weapons in the latter scenario would typically need to be nerfed to provide adequate game play since the human brains are currently more effective fighters than our current AI tech.
You can easily test this without being a developer, by simply recognizing just how different the gameplay is when comparing how a map flows while playing it PvP as opposed to playing it PvE. The flows will typically be very different with each requiring a very different style of play.
More broadly speaking, the "PvE balancing act" is a different animal than the "PvP balancing act" and what works for one will typically not work for the other.
So as far as I'm concerned, they need to split the weapon and vehicle balancing between these 2 very different styles of gameplay. PvP needs nerfs and PvE needs buffs, it's always been this way.
I may not be an expert, but after thousands of hours developing combat gaming missions since 2001 for the Arma/Flashpoint series (which is heavily based upon AI technologies) I've learned a couple things about the differences between the way that AI fight and the way that human's fight... and I'll leave it at that.