I mean you have to check your brain at the door to accept most of the precepts of "Star Trek" and just enjoy the stories and characters.
"Suspending disbelief" and "checking your brain at the door" are different things. Not that I don't think you know that, but I think you're mixing them up here.
"Suspending disbelief" for fictional creeations, like letters of transit in Casablanca for isntance, is no big thing as long as the story plays by the rules it sets up. (Haven't seen Casablanca in a while but I don't remember it too obviously fluffing anything in this sense.) "Checking your brain at the door" is what you have to do when there
are no evident rules. Trek has veered between those two poles over the years, but it's pure revisionism to suggest it's always just inhabited the latter just because that happens to be the route JJTrek chose.