I have used Remote for Tesla for a long time, originally in 2015 with Apple Watch 3and my Model S. I have had zero problems and it easily controls the functions I use. Of course I admit that I use the iPhone for opening, closing and operation. Mostly I use the Remote for Tesla to monitor and manage charging, plus HVAC functions from time to time, preconditioning for hot or cold weather.
Stats works too, but I find it a trifle inelegant. Petty objection, I know. OTOH, one of my medical friends went out and bought a Tesla after seeing the app on my watch. He is a bit of a nerd but the watch app seemed be his triggering event.
I am confident we'll see more features soon from Apple Watch 6 revised apps.