Yeah it could just be because everyone's still taking the sorts of armies that worked with the old metagame. Prepatch small forces of expensive heavies worked well, but now they'll be far too vulnerable to ATGM spam without some cheap stuff to bulk them out. But hopefully ATGM spam will be vulnerable to arty and 10-20 point unit spam that can just overwhelm it, while cheap unit spam alone will still be weak to heavies and the newly buffed mediums. That way your force will eventually have to be a good mix of ATGMs, cheap spammy stuff and a few medium tanks and/ or heavies to boot.
Unless of course 10-20 point units and arty can't
beat ATGM spam, in which case we'll have a bit of a problem
EDIT: The most spammable ATGMs (infantry and jeeps) are extremely vulnerable to arty and can be killed by small arms fire and one-shotted by T55s, BMP1s and other such fodder units, so they're not without their downsides. You can get around that (as PACT anyway) by taking tanks with ATGMs, but then you're paying significantly more per missile, which means that you're still going to be at risk of being overwhelmed by cheap unit spam since you'll be firing less ATGMs per volley than you would be if you'd went for jeeps or infantry.