It's not nearly the same. An ISU with its ass backwards is incapable of fighting back and the PaK can kill it. Ergo, it's a terrible mistake, and will cost you all dem units.
What I'm saying is that running many infantry straight into an HMG should also be a terrible mistake.
Hardly. Splitting the blob is is decent play. If your opponent blobs, and you play well, the blob will melt and you'll win because better play.
Simple relationship.
If you try fight a blob one unit at a time you played even more horribly then the blobber and are punished for it.
Just earlier you said that it's fine for the blob to walk over the MG with minimal losses - this is the point of contention. If the blobbing is splitting, attacking from the side, or from around a corner... that's different.
No one is saying that a lone MG is good play, or that it should work well. It's a point about the mechanics of the game which have moved in a distinctly blobby direction since WF came out.
Personally, I think that if you have one or two squads with an HMG, and a fucknormous blob walks directly into the HMG, the blob should either retreat or get killed ... and as of right now, if you have the right balance of PFusiliers in that blob, the blob might be just fine.