That’s really not that relevant if teleporting all over the place is possible in lore. It’s more relevant if unrestrained teleporting makes for a more engaging game.
Not usual, but I disagree with you on this one. Both are important imo, one for the "role" and the other for the "play".
In general I am in favour of making up a narrative excuse if it enhances the experience. As of now, I don't think fast travel is well explained through the narrative, nor do I think that it enhances the gameplay.
There is shockigly little effort put (as of now) to make things feel native to the world. That is in general a worryingly lazy design, and especially for story centric genre like RPGs. I am struggling to come up with an cRPG that would be as bad in that regard as BG3.