honestly making bots that work for every match isn't easy, there are tons of weapons,mechs, pilots and combinations to fomr with al lthese things.
i see the problems with both maxing and having a lower level weapons set up on bots, especially because of how difficult they are to setup. if this game was more like unreal with no change in weapons, its easier to setup, with in mech arena that isn't the case...
for example, if the mech and weapons are low, with its ai not properly setup, it will likely get blasted to pieces fairly quickly or even have it that the other player has no proper allies that can defend them. on the other hand, if they are max or near max level, they'll be able to hold their ground but at times may do so too well by being bullet sponges or hitting your mech perfectly in a way that your mech gets destroyed in a second or two.
the maps are also all different, and the ai could perhaps be setup the same way as in the video game fear, but since not every match is the same this could be difficult and pose some problems and even put mroe strain the the servers perhaps? but this is may point of view on all of this.