Learn to use grenades, then you can dominate blobs and not retreat. Seriously, if you know how to use your abilities blobs are worthless and cost your opponent way more resources.
CoH2 is the most forgiving RTS game there ever was. You literally could not cap anything and it will still take 15 minutes for you to lose.
Proper support weapon usage will definitely stop blobs. If he's rushing you with a blob of squads, a single machine gun will stop them in their tracks. Then they're fodder for any of your other units, including your mortar.
All these suggestions for anti-blob auras are ridiculously "scrubby". It's akin to when in a fighting game people complain about repeatedly being thrown. It's an anti-competitive attitude, where instead of improving your own play to beat a strategy you're instead calling for the developers to gimp it so people stop doing it.
Lets see your player card please.
Anyway using nades with 30% less munitions isnt that easy. Perfect example last game every nade I threw was dodged. You sir either
A.) Havent played anyone with skill
B.) Dont play all factions
C.) Both
D.) Are actually good at one faction ignore the others and are otherwise silly if you think blobbing is OK and easily punished.