Mate you missing all my points now. I explained everything before. In the end you will not stop player from blobing, everyone blob in rts games sc2 coh serious and other games...
It's meta so deal with it.
Umm... yes you can stop them from blobbing, if you make it as undesirable as possible.
No, nobody can stop people from blobbing, but the disadvantages are such that if you do blob and the opponent has a clue, then they won't do it again in a hurry.
And in other RTS games, people don't blob. Wargame is a perfect example where if your units are blobbed up, the morale effect of artillery, aircraft etc makes them almost entirely combat ineffective and easy picking for an enemy. Thus you are rewarded for spreading out your units more than just rushing everything toward the enemy as fast as possible.
CoH2 doesn't have a morale system (a conventional one I mean, suppression kinda is one), so other ways need to be thought up.
My suggestions would be to make their received accuracy higher and a received damage increase when a certain amount of squads are too close to each other, say 3.
The options are there. The meta exists to be changed.