You'd think increasing suppression and received damage the more units are near one another would be a thought, but no. Why even call it a tactical RTS?
I agree with you on this for sure. I thought it was a problem in COH2 as well. There are so many mechanics available to punish the use of blobbing on a game design level (Things like giving infantry bunched up a negative cover modifier, Friendly fire damage penalty, etc).
Blobbing and clicking attack move around the map should not be as viable a tactic as it is.