It's a smart move to do so instead of switching to Android Auto and loosing control of one of the most important component of the experience of the car.
Me too - its fine for me. You are probably holding it wrong 8)
My car (Seic MG4 - an EV) clearly has two lots of software. The reliable stuff that runs the "must work" stuff like driving controls and motors etc. and the other stuff that ought to work in an ideal world and I think that lot is on the Android tablet mid dashboard.
The other stuff even includes "lane assist" and other safety features because when I force re-boot the console they report as offline on the display behind the steering wheel, which I think is linked to the first system - the RTOS automotive jobbie.
I think SEIC (and I'm sure this is standard practice) have done a fairly decent job with the divvy up of responsibility between funky features and must work or death will ensure features. I'm an IT consultant and know when Android auto has crashed on my phone or car or both or the radio is on silent or there is dust in a USB port ...
Wayland vs X11 is not an issue in cars - whatever you get will either work always or be a bit of a mild distraction.
Cheers Jon
PS I went to school in Abingdon, Oxfordshire. My car has nothing in common with the real Morris Garage. The MG marque is merely an affectation and I don't know why Seic really bothers.
If you're only using a Wayland compositor to render a webview, you cut out a lot of the surface area that could potentially cause a crash.