In real life spaa would not even survive encounter against tanks but WT is not real life so I don’t complain about spaa killing my tank in battle.
Its stupid that some SPAAs are stronger than tanks
I know that because people complain a lot about the Gepard in forum.
Possibly the only way to improve it is to rip it up and start again.
It has progressed too far with baked in and possibly intended flaws, no amount of patches or improvements can fix something that was fundamentally broken in the first place, all the problems are known about but there is no incentive or will to fix them or they are just impossible to fix in the games current state without totally destroying it.
So to improve it, remake it with all the knowledge gained over the years of the flaws, problems and mistakes.