As you said, to an extent. Any entertainment requires a certain amount of suspension of disbelief. The more "real" that entertainment is, like, say, Cheers, the less suspension of disbelief is required. The less real it is...for instance, Spongebob Squarepants, the more suspension of disbelief is required (in this example, an astronomical amount). I think (and I may be wrong; I've never studied the phenomenon in depth) that an audience will allow for a greater need for suspension of disbelief with an entertainment that they value. Obviously, the crowd here values Trek and it's many iterations highly, else we wouldn't be here discussing it at all. So that audience is willing to say "Yeah, that's clearly a set, but screw it" or to say (while groaning) "Why did her hair change between shots?"
So, it's because of the value that we place on Trek that we're willing to overlook little things. But, the definition of "little things" varies from person to person, from sub-fandom to sub-fandom, and from fandom to non-fandom. Generally, I'd expect a post on a topic in "Trek Tech" to be less forgiving of tech-based concerns, and thus more likely to find an in-universe means of explaining a discrepancy.