Come to think of it, wouldn't a bridge with turbolift doors flanking the viewscreen make a lot of sense? The captain would have a clear view of the comings and goings, and anyone they happened to be talking to wouldn't see if there was sneakiness going on.
Speaking in-universe, yes, that would be more practical, I suppose. But looking at it from a TV show perspective, I guess it's better to have the main character and the door in one frame. I also requires fewer camera set ups and saves production time.