As far as I remember, Tesla does allow 3rd party well-known repair shops to fix Tesla's under warranty to some extent.
Doing wheel alignment, replacing suspension parts, broken seat adjustment buttons - it's all very easy and does not
require complex training. For Model X/S body repair and airbags was the limit - they did not send airbags to anybody
but their own service centers and most repair shops don't handle aluminum at all.
Aluminum problem will be solved (door and hatches can be just replaced). Airbag/crash stuff might require training.
Tesla does allow independent shops to get some license with requirements and training. This training is doable.
Independent shop will get software+hardware for diagnostics and some tools specific to Tesla (if any).
Nowadays it is popular to just write off the vehicle rather than fix after medium or high severity crash.
Tesla has stated clearly and many times: they will not try to make money on servicing their vehicles.
Therefore they are also not interested in expanding their infrastructure to the extent normal car manufacturers do.
And rather allow free market to do it's job. Of course they need some capacity to do the extensive/complicated stuff.
If M3 reliability is way above market average this also solves a lot. We already know that servicing EV-s is less demanding.
Doing wheel alignment, replacing suspension parts, broken seat adjustment buttons - it's all very easy and does not
require complex training. For Model X/S body repair and airbags was the limit - they did not send airbags to anybody
but their own service centers and most repair shops don't handle aluminum at all.
Aluminum problem will be solved (door and hatches can be just replaced). Airbag/crash stuff might require training.
Tesla does allow independent shops to get some license with requirements and training. This training is doable.
Independent shop will get software+hardware for diagnostics and some tools specific to Tesla (if any).
Nowadays it is popular to just write off the vehicle rather than fix after medium or high severity crash.
Tesla has stated clearly and many times: they will not try to make money on servicing their vehicles.
Therefore they are also not interested in expanding their infrastructure to the extent normal car manufacturers do.
And rather allow free market to do it's job. Of course they need some capacity to do the extensive/complicated stuff.
If M3 reliability is way above market average this also solves a lot. We already know that servicing EV-s is less demanding.