My counterpoint would be that before the widespread availability of chat and things like that, it was considered perfectly normal in most workplaces to swing by someone's desk. The modern obsession with "deep work" in some circles is mostly a modern invention. (At least in places that didn't commonly have offices where you could open or shut the door as a signal.)
However, I wish our culture considered it rude to just walk up to someone in the middle of deep work and ask them something - unless it’s really important and time critical. It could be a simple as sending a message first “free for a quick chat?”