If my husband is on the phone, I like him in his office with the doors closed.
Closet doors are closed always.
If I’m doing laundry, I like that door closed, otherwise it is usually open.
The rest of the doors are for bathrooms and bedrooms, and only are closed when needed.
The only exception to the above, is when grandchildren are over, and depending on which ones, different doors may be closed for safety reasons.