I know you don't play allies Vodyani but try playing USF a bit and you'll see what I mean.
Pressing buttons is not the problem. The constant rotating and turning is. You need to reverse into combat, before firing stop, and then pull the brake so it doesn't constantly rotate when trying to fire. The engine probably is telling the computer to turn the HT the "right" way but the arc of fire is in the "reverse" way. Horrible. Also, AA HT needs to stop to fire the larger caliber shells. On the move it can only fire the MG which suppresses poorly. The main gun needs the HT to be stationary to fire.
God forbid that the AAHT is in trouble and you need a quick escape, that sh** will rotate and rotate. The smoke on flak + fast deployment > AAHT. AA HT is still good, no doubt, but cancerous and worst AA unit of all due to tracking and constant bugging out. Flak is also much better AI but is slower and needs deployment, which is fast enough but still needed. Also smoke.
So I stand behind that the raketen is a much bigger cancer for AA HT than anything else is for the flak, due to smoke mainly.
I do play USF from time to time, though mainly for meme or OP builds. Sometimes the AAHT as well, as it's so powerful in the CPT.
I can see (and have seen it in game) the forced rotation being a problem, but if you have the enemy in your rear arc, you have much bigger problems to deal with. Such as the fact that they have flanked you and have your retreat path cut off. With a flak HT you'd be in dire trouble as well (choose between standing your ground to die potentially or run off), M5 Quad less so but that thing has a very expensive upgrade requirement.
Of course the mobile MG has poor suppression, it can't be a proper MG on treads.
USF has an AA unit?