I had that exact same issue. I just turned off the Wi-Fi in the car because it would take a solid 15 to 30 seconds to figure out that it was time to change the cellular.I would just like it to be stable. I find issues when going from Wi-Fi in my garage to cellular. It is much better now later in the beta period but still delays when going between Wi-Fi and cellular.
I have not had to do one of your namesake resets for a long time for SiriusXM. That tells me Lucid/SiriusXM are tweaking and getting overall improvements (perhaps on the server side) even without OTA updates to the car.
It’s very usable now in its current state so I think it’s close. No one should complain. They are not charging for it. Tesla has no SiriusXM option at all other than Bluetooth to your phone app.