Quite so.You are confusing ‘facts’ about the production with ‘facts’ about the fictional universe the shows take place in. I am referring to the latter. William Shatner being an actor in TOS is a fact. Warp drive is not a fact. It is a fictitious construct with no real scientific plausibility used a plot device to tell a story, and its functions change at the whim of the scriptwriter.
It confounds me how often some people conflate "Doyleist" arguments with "Watsonian" arguments. Both can be interesting. Both can be relevant, in different contexts. But they're not the same thing, and you can't use one as a response to the other.