>skip cutscene
I'm only talking about the original game. There's a difference between not being able to summarize a story and attempting to summarize things and getting a lot ass-backwards. It's a little different now that superfans have been talking about the game for multiple decades and a lot of this info is, y'know, archived, but for a long time, and now, you saw much of the latter online with regards to 7 because of all the unreliable narrators and how some key info is revealed in a rather casual away. Maybe we could call it deceptively simple?
And I feel I'd have to disagree about summarizing most of them. Like, few except superfans are gonna be able to remember everything, I think that most people who played 9 (until they have to remember the last 5%) and 10, and V, and 4, and 6, and 1, and [dies of age] are going to be able to remember the general shape of the game. They probably don't remember anything as each of these games have a fair amount of fluff, but that's different from getting tricked by the game or something like 8 where dudes are just gonna be totally lost.
In any case, it's a moot point because the actual complaint people have seems to be in regards to stories just being poorly told, not how complex they are or aren't.