They are definitely closer to game breaking than they are to just being annoying. Sure AA counters it well, but you shouldn't need AA just to prevent losing half of your army to one click of the mouse
Not saying you shouldn't be punished at all for not having AA, but you shouldn't be punished THIS much by something that requires absolutely zero effort to use. When you react instantly to dodge and still take heavy losses, that's a problem
While I don't disagree with you if we don't come up with more anti blob abilities the blob will only grow bigger. This has been an issue since the dawn of COH.
Remember US Strafe Plane in Coh1 how cancer that thing was just wiping armies because it would have no warning and the solution was not to blob.
Blobbing is easy and its why everyone does it but complains when their army gets wiped.