Not necessarily dealerships. I used plenty of "independent" service networks (repair-only shops), not strictly affiliated with a particular brand but authorized

Not necessarily dealerships. I used plenty of "independent" service networks (repair-only shops), not strictly affiliated with a particular brand but authorized by them. They have mechanics trained for the brands, access to spare parts, etc. I'm not sure it's a matter of "getting away". I would have thought it's in their interest to offer a solid support network after sale. I wonder if the tight control is due to not having enough capacity to make enough (spare) parts.