Unfortunately, you cannot truly stop spawn camping in any shooter type video game. The best you can manage to do is bring it down to a reasonable level.
Usually when spawn pushing ensues en masse, it means your team has completely collapsed and the match is in the process of folding.
Early game spawn camping by any unit type is a different beast. Ultimately it’s either map design, the spawn system, or objective design at fault.
For CAS specifically, I lay the blame on the entire Spawn Point system - specifically the very ability or even notion that “you must earn the right to use an airplane.” No matter how SP costs get changed, one side will always get air up before the other side, often before the other side thinks to use counters, and then the other side proceeds to scream and cry about it. Common calls to “raise CAS SP costs” only slightly delay the problem and not fix it seriously.
I think Simulator’s idea of SP is a major step in the right direction. How it works:
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All players start with 1000SP
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No more earning SP from any actions whatsoever
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No more point doubling upon death
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Aircraft are forced to spawn on the runway and actually take off
CAS can be first-spawns, but outside specific machines with blatantly-overperforming weapons like the Ka-50/52 Vkhir missile, it allows both sides to fight fire with fire right from the moment the round begins. Early game CAS can now be swatted by fighters without either side needing to do gamey cap-rushing BS. A bad pilot will die early on, waste most of his/her SP, and maybe get one half-decent tank to use afterwards. CAS will then turn on and clean itself up as the community quickly learns.
I do like the idea of adding non-player ground units around caps and spawns, but making them immortal will only create more of a mess than you can possibly imagine. Calm yourself down, leave your anger and rage and hate behind, and seriously think about the consequences, not just what you personally want.
Tanks and planes need more objectives to kill than just exclusively each other, with enough ticket and grind value to actually be worthwhile to kill. The mode feels like a pressure cooker right now for everyone - tanks feel like fish in a barrel and planes honestly get bored with the lack of variety in what they’re asked to go do.
If I had some other targets to kill on maps which actually mattered to map victory, at least some of my gunfire/ordinance on my CAS would go to those instead of just player tanks.