These games always took some liberties with the whole "party of <number>" aspect, hence the term "blobber" (they act as a single entity).
Quite so, they act as a single entity, which makes it mechanically identical to a game with a single entity.
Wrong. They act as a single entity - in some situations only. Like in case of map movement. To some extent also combat - namely positioning in combat - although many blobbers have some form of limited positioning within the blob. The characters do other stuff individually, same as in other types of crpgs. They attack, use abilities in combat and outside of it, have stats, individual inventories, can die individually, etc.. etc...
So now "blobbers" have parties that act
"a single entity - in some situations only".
OK sure, it's a made up term. It means what you want it to mean, doesn't mean it actually exists. There is no mechanical difference between whatever you call "blobbers" or "gridders" and any other first person RPG.
That's best demonstrated in the disappearance of the "blobber", because people realized it was
pointless.
Having a party of 4 is the same as having a party of one character with four abilities and that was way cooler regardless. The "blobber" was just an abstraction for single players to pretend they had a party, because RPGs always had a party. It was like that in the old days.
We're still playing the same type of game, now it's just done with a single character. Same game mechanics. The "blobber" never existed.
What really piques my interest is how many people are triggered by this observation.