The game devolves into an arty fest because it's one of the only remaining ways to ACTUALLY punish blobs, not just delay them and not all factions can even delay them with mgs. Same reason the sturmtiger used to be so good, same with the demo same with the brumm. As long as patches make it harder and harder to bleed the enemy in any meaningful way something that does will take the spot light. Luckily for blobbers everywhere we're almost out of tools to do that.
And why all of these things are getting nerfs?
Because there is some unspoken rule and conviction that if it has legs, it should never die.
Much more expensive vehicles? Who cares, let them be killed in seconds, but 240-280 mp infantry? No, nothing should be able to wipe them and they should always live through whole game because reasons.
Everything that is even remote threat to blobs is being nerfed into oblivion, yeah, if its good vs blob, its also good vs single squad, but in that case, maybe that other player should bring more of combined arms with some mechanized units instead of infantry megablob and they cry that expensive flamethrower tank or big boom gun killed that blob.