It breaks down to 3 scenarios.
1) "Toyota Customer Care"... 5K 10K checkups etc. Not covered outside of CA authorized dealers. I've already been down this road with my 5k at my local dealer... 5K performed, then denied by Toyota. No matter what your dealer tells you, it won't be covered under "Toyota Customer Care"
2) Ev drivetrain problems, mostly Tesla stuff. Not covered outside of CA authorized dealers.
3) Good news, Toyota is willing to help out-of-state'er for some non EV drivetrain failures like my co-workers failed heater on a "case by case basis". They have an authorized field engineer coming to a local dealer to perform the work. It has nothing to do with the dealer themselves, it's just a place to work on the car.
It's nice to hear there is some flexibility with Toyota's warranty support for out-of-state owners. That heater repair is over $3000 in parts alone, so it gives me a little peace of mind. I'm still prepared to ship to CA for big stuff... 10,000 miles so far and zero issues.