I agree, but for missile AA there might be a need in the future.
I would like 'y all opinions about this old forum post about the different SAM guided systems of the French defence industry: List of French Roland/Crotale platforms - General & Upcoming - War Thunder - Official Forum
Personally I want to see more variants of the crotale system and the Roland system in WT.
But indeed, outside of prototypes and a few truck-mounted SAMs, all major in-service AA systems are already in game. I just personally want to see the Finnish vehicle with the crotale system be replaced and some variants of the Roland be added, but I understand that these are not an urgent need for WT at the moment.
Only for the near future some medium/long range missile will need to be added to counter the long-range air threat that won’t be in reach of a VT-1. The Pantsir has a monopoly on the airspace, which would need a counterpart in each tech tree, especially now that Gaijin keeps adding longer range munitions which often cannot be countered by current SPAA/SAM.