@Antonela0
I'm actually glad that Airbnb allows this option with check-in and out times to accommodate host wishes on separate days for one guest leaving and another arriving. I for one wouldn't want a turn over on the same day, actually couldn't even do it.
While I fully agree with @Victoria57 about Airbnb's cryptic website issues, I personally think that with these options of the issue you raised are extremely useful to any normal person who needs a certain constellation. The options just have to be used with common sense and different scenarios in mind.