That's indeed the whole point with panzershrecks. OKW has many specialized anti-infantry units and a crappy AT gun. The panzershreks were the glue that held the faction together and allowed for several different playstyles. I don't see how this was a bad thing.
All of the changes made in the past that led to more variety always improved the game. Nerfing of the call-in meta made a lot more commanders viable for all factions. Removing OKWs resource penalty opened up a lot more strategies for them. Removing shreks will do the opposite of that.
+1 Shreks where to strong maybe, but they fit in. Snares where available through comanders. Panzerfusies now have the same role as volks. It's narrowing the gameplay. Allthough the raketten is fine it needs some at support and shrecks fullfill that role perfectly. The AI nerf of the shrecks is good (shreck upgrade means -20% nerf on AI) nerf the long range accuracy and they will be fine and will give the gameplay more variety.