Lets be real here.
First of all, what is a blob?
I think we can agree it means a large amount of units in one concentrated place.
Second, why is that a bad thing?
Well, it isnt.
A blob becomes a problem if one or both of the following is true:
-Your build cannot handle blobs
-You havent pulled your units together to counter their blob.
In both cases, its a matter of player error in judgement.
Blobbing should not be part of this game. If it is, why introduce the cover system? The TrueSight system is just a waste of time if everybody's gonna blob through MG and kill everything in it's path. I find that this ruins the feeling of playing COH. In COH1 ( Goodness, I hate saying COH1 is better in these aspects ) The MG can really stop blobs and really required you to flank the MG while in COH2, you can have like 5 squads of infantry load them up with some sort of LMG (preferably M1918/MG34) and watch as everything just disappears. In fact, shooting on the move with LMG is unrealistic. You can shoot them on the move IRL but while causing so much damage? Come on, we know that is extremely unlikely.