I know the frustration. I prefer to use small units - the emphasis on heavies, to me, loses the beauty of ZK. Heavy games are always all-or-nothing - either you kill the heavy or the heavy does some damage, retreats, heals, and wins by attrition. For this purpose, the whole bomber game is heavy - the nuke bomber is the queen of this - it flies home with
zero lost unless you've got some obscene AA investment.
But there's so much riot firepower going around that it seems like investing in anything smallish in the late game these days is suicide. You can't build up a huge force if you're taking losses every time your troops get breathed-on wrong, while your heavier foes keep snowballing.
Because of this, the skirmishy units that
feel like they should be good at heavies are actually a terrible long-term investment. Your whole force of rockos or rogues or recluses, carefully protected by riots, all get obliterated by a single napalm bomber. There was no battle, no last stand - just "boom, all your crap's dead or dying".
I'm not sure what to do about that mess, but I'm not happy with that part of the game.
On the other hand, it seems like "buff/add AA" is the wrong solution. The hardcountery world of AA/Not AA isn't fun for anybody. I'd love to see one of the labs go without dedicated AA but explore having flex-AA in nearly every unit - the Banisher is a good model for this. If we're going to keep the Veh lab without dedicated AA, then how about we put flex-AA weapons on
everything in the lab? The Dart, the Leveler - keep the stats the same, but their cannons are now flex-missiles.
Or swap the Samson and the Copperhead and do something similar with the Tank lab - replace the Goli's flamethrower with an AA laser, make the Welder's pew-pew into a flex-missile. Heck, be stupidly fancy and crank up the rotation speed and add burnblow to the Pillager. Probably wouldn't hit a plane to save its life, but could be hilarious against gunship-swarms.
I have an even crazier idea for a flex-AA unit in the Cloakybot lab, but I have experiments I want to do on that front first.