What parent @waisbrot is saying seems uncommon (the source of this whole conversation), but granted, perhaps common enough (or is it instead worrisome enough) that nvim community took it out.

I still type :Q and :W as well, but that is not what is being discussed.

Have you ever irrevocably bricked your system, as @waisbrot mentioned they have twice, from typing :W or :Q? Have you ever bricked your system from typing :X? If so, that isn’t a “use :x vs :wq” problem, that’s seems more of a use common sense problem.