Glass Onion takes the well-worn detective genre and creates some genuinely surprising moments by "cheating" a little with what it shows the audience.

This article says it should have played it straight. I think that would have made for a more standard, boring movie. But whatever, that's just opinion.

But I think it is silly to call it bad writing. Bad implies that the writer didn't have command of their craft. It is clearly all very deliberate and designed to create something surprising in a genre where that is very difficult. Like it or hate it, at least it tried something instead of just being another remake of Agatha Christie's "And Then There Was One".