I am mostly referring to show or movie creators answering questions in ways that might effect the lore. They don’t have to be plot holes, super significant, or still held to be canon.
For example maybe it was a small detail they elaborated on or they answered a long running question.
I was originally going to give the example of why characters in Star Wars don’t toggle their light sabers on and off during combat but it seems like the explanation I was more of a fan theory from what I can tell.
The question can also apply to video games if you have an answer with one of them.
I believe the in-lore explanation is that the teleporter always has to be in the path of any transport. So if going from the bridge to a planet, the teleporter actually teleports you twice: once from the bridge to the teleporter buffer, and next from the buffer to the planet. The room was where the teleporter was physically located.
With improved technology later in the timeline (Discovery), they did in fact abandon the need for the teleporter room altogether.
For what it’s worth, they never did address the most fascinating aspect of teleporters: that in the future they solved the problem of how to transfer consciousness. Though the existence of Thomas Riker does raise issues that are unresolved unless you accept that either teleporters do in fact kill you or consciousness can be copied. Based on how willing people are to step into them, you would imagine it’s not the former.