Maybe there is another factor going on. I am one of those who is less happy about service even though my Model 3 is built much better than our 2015 P85D and requires many fewer trips down there. The reason for that is pretty simple: communication. I can no longer get anyone on the phone or to answer the text system or emails at my local service center. And they are not inputting the status in the app correctly, so twice now the app has said the car was done, so I drove 3 hours round trip to pick up the car, taking off work early, etc. The app status was input wrong and the car wasn’t completed yet, so I was unable to pick the car up. The 2nd time I tried and tried to confirm the car was done before making the drive to no avail, there was no way to confirm short of showing up to talk to someone.
That is only one of the many frustrating experiences I have had with service in the last year. I could go on for hours, but suffice to say service has gone sharply downhill since I bought my first S. Even if you improve initial quality, if the experience gets worse when folks have to go in, they become less happy.