the door closes without rubbing This is not perfectionism, it is part of making sure the opening performs the way it was sold.
You should also ask about care after installation. That kind of guidance is especially useful for homeowners who have had recurring drafts, sticking, or water intrusion and want to know whether the new installation has truly solved the issue.
A door that looks passable from across the room can still be wasting energy, inviting noise, or creating a security weakness.
When that happens, the improvement shows up every time you use the entry, and that is the real measure of a job well window replacement Flower Mound done.