Lets just swap them around

Serious answer:
Raketenwerfer has no gun shield, takes longer to shoot, has less range and has a crew that clumps up like crazy which still makes it vulnerable to being wiped. It also gets very few scatter hits because as soon as the accuracy rolls a miss the thing is likely to shoot into the ground. So yeah, the Raketenwerfer is not OP and shouldn't get nerfed like that. I would build a regular AT-gun every time instead of Raketenwerfer if OKW had one available.