It doesn’t really matter what anybody who boards thinks about turnout, it’s about what that boarding barn does. Barns all do what works for them for a variety of good reasons, like they don’t have any space, tearing up the ground or lack of staff to turn them out and put them back in. Some lame reasons too, crackpot theories or just lazy. But it is their business and possibly their property as well. They don’t change to suit individual boarders.
Boarding is compromise, pick one you can live with based on what you see on your first visit. Don’t wait until it becomes a problem and then research it.