Because they are short-term and many are staying just for the day + bringing family (like kids, which is why they use AirBNB instead of a hotel). The check-in/check-out already add an entry-exit if the user is staying 24 hours only.
It’s not super common to stay in one place only 24h when traveling with kids. Other than the luggage, tourists and residents move in an out of the building just the same. People who live there also need to go to work or school every morning, and come back in the afternoon creating choke points. And these people are there every day, not a handful of seasonal tourists.
The problem is probably the same as every other super tall building. It was impressive for the potential buyers but designed poorly and this only became apparent after they lived there a while (crappy elevators, probably often defective, building sway, plumbing issues, etc). So the owners started to move out and it’s possible the building is mostly short term rental now.
