Videoconferencing has become more accepted as a technology. More people know how to do it. And peopled being ‘zoomed into a meeting’ are no longer the outsiders, only half in the meeting with people in a room.
In-office visits are hard to coordinate. They can’t return until people are back in the office, but all people aren’t going back to the office all the time. If there are a quarter fewer in-office days overall, that makes coordinating business meetings harder and there will be fewer business trips.