A PaK 43 is a hard counter to mediums but gets swarmed. Same with Jagdtigers, Elephants. All hard counters, all get overwhelmed.
And what do you have to do when you OVERWHELM JTs, Elefants or even PaK43s?
You have to move your tanks and flank those hardcounters! What do you think will happen if you drive 5 T-34/76s towards an Elefant and stop in front of it? Do you expect them to kill it by doing nothing?
No, they'll get destroyed.
The same should apply for every blob. If a player moves his blob into an HMG and then does nothing he shouldn't win. Period.
The video that has been posted here is a perfect example: It would have been easy to overwhlem that MG34 by...wait...not blobbing.
The Soviet player could have used one squad as scout and the other 3 squads could have flanked that HMG while it was shooting at the scout.
Even if those Cons didn't have PTRS they could have won simply by splitting up.
An HMG shouldn't win against large numbers of infantry. That'd be a bit OP.
An HMG should win against blobs if the other player doesn't use his advantage (superior numbers) to actually flank it.