Well, in fairness, `:X` brings up a prompt, so an accidental `:X` won't seamlessly masquerade itself as `:x`.

Otherwise, I feel a remap is just a valid option as any to disable it. I'm not sure there's a way (a quick skim of the docs made me think `set key=` would do it but that didn't work for me, or at least I didn't understand what it does) but either way you'd still have to add config.

But again, as I say to everyone I see using commands to quit and keeps getting brought up here: `ZZ` is the same thing.