Having good SPAA at every tier is important in Ground RB because of how abusive CAS can be without it. When a nation (especially a “Big 3” nation) does not have competent SPAA, then anytime that nation is on its own, the match becomes very one-sided. The US often finds itself fighting the USSR and Germany, which have the best SPAA lines in the game. Granted, the US has the best CAS lines in the game, but that doesn’t mean much if one side’s CAS can’t have an effect on the battlefield while the other side’s can, or if the SP cost differential between CAS and SPAA is 800.
The US’s SPAA line is truly in a sorry state:
Ranks I and II are tolerable given the limited ordinance for CAS at those BRs and relatively slow aircraft, but then again, SPAA has never been that important here.
Things start to get bad at Rank III. The M19 and M42 are very easy to kill by aircraft and their slow ROF makes it more difficult to hit planes than the Sd.Kfz. 251/21, Wirbelwind, and BTR-152D. Even Britain can bring the Ystervark, Crusader AA, and Bosvark.
Rank IV SPAA is literally non-existent for the US. Meanwhile every other nation in the game has fast-firing, high-velocity guns. Germany has the Zestorer and the wirbelwind is still pretty effective. Russia and many of the minor nations have things like the BTR-ZD, R3-T20, and the AMX-10P which obliterate CAS.
It’s not until Rank V that the US gets another SPAA which is, again, disappointing. The M163 has a high ROF, but it does not have the range/velocity to deal with jets or helicopters.
At Rank VI the US gets the M247 which is okay, and the Chaparral, which doesn’t need explanation.
At Rank VII the US gets the LAV-AD and XM975, which are mediocre at best.
And at Rank VIII the US doesn’t even have an SPAA. It gets a “TD” in the SPAA line, which is, again, a garbage SPAA compared to the Pantsir and ITO which it usually faces, as well as having higher SP cost, even though it sucks as a TD too because it’s slow and can’t fire its missiles on the move.
The US has been in the game for a very long time and is still severely lacking in competent SPAAs across the board. It would be nice for the US to finally get some decent SPAAs to deal with CAS.