Because so many of us get emotional about the minutiae of the "Star Trek universe" and its continuity.
How "real" is this piece of made-up pooh-bah compared to that piece?
We talk about things like "the post-Dominion War era" as if it matters.
"How soon do you think we'll have something like the transporter, if ever?" I mean, that's a completely meaningless question for several reasons, but we can generate pages of discussion about it that appear to be predicated on a consensus that there's a chance that we can derive an answer.
It also doesn't help when the occasional whacko shows up for jury duty in a Trek costume while calling it a "uniform."
EDIT: I see spookytage
beat me to that last observation.
A fictional franchise is only mildly comparable to a sports team, unless you're talking about something like the WWE.