Yes, that's right. There's only one die roll per character in combat, and there are no decisions to make per-character. It would be a boring game played co-op, I think.
Best to think of it like a JRPG, where you might have e.g. 4 characters in your party, but are playing solo.
I think it's a little bit of "obsession", and a lot of "I keep the games as easy to produce as possible". Which might be a problem: I assume good art and high production values mean more people will try the games.
