Don't know, my experience has directly contradicted this popular narrative. I think, perhaps, these experiences are less frequent than public outlets suggest.
Tesla owner since 2015 here. We don't even have a service center here in the Boise, Idaho area (closest one is Salt Lake) just Mobile Techs. Had always had great service experience with our Model X and 3 (sold the S for the newer tech on the Model 3). They show up on our driveway after I schedule service on the app.
We now have two technicians because of the influx of new owners, which is surprising to me since Boise is not exactly a major city.
I've had issues getting parts for my model S. Additionally the service experience has generally been a complete shitshow. I deeply regret purchasing it.
That is the fear I had in the back of my mind standing in line to reserve a car, sight unseen. Really sorry you have had such a bad time, hope it will improve for you.