You were right

I think seeing the murder isn't even solving it.

Not to mention, watching an extra hour of movie just to see what you already know isn't interesting. I don't care how many onion metaphors Rian puts in the movie, it doesn't make it anymore interesting.

That's not genius, it's just Rian Johnson subverting expectations like that itself is a good trick and satsifying. If you see the murder, the mystery is over, and if you don't see the murder, fuck you because you have no chance to figure it out.

The first movie does the same subversion schtick. We "see" how he died so we spend the movie not worrying about the whodunnit aspect, but we also suspect foul play, at which point the obvious candidate is the ONE suspect they focused on for the second half of the movie. Atleast that one had the "Hugh did it" scene, but Glass Onion is just not a mystery movie, it's a "let me explain exactly what's happening as it's happening while leaving out the actually important details so I can make a cheap revelation scene at the end to explain the mystery you had no chance at solving yourself". It's not genius, it's disappointing.

Unearned misdirection is just gaslighting, and when he's been doing that since atleast Looper it isn't clever anymore.

I wanna know why Rian Johnson immediately explains motives and clues, all while making the actual mystery impossible to solve.