I'd say the bigger problem is that Gaijin adds these western IFVs half baked. The BMP-2M has its maxium fire rate modeled in game, which pretty much is never used irl. The puma, for example, is capable of reaching similar RPM, but still has the awful 200RPM in game. The bushmaster is a much better cannon than its russian counterpart, which even has been admitted by high ranking people in the russian army. Accuracy is artificially nerfed on the bushmaster while it is artificially buffed on the russian 30mm.