That said, I miss CarPlay for Messages (recently added to Tesla but not as good) and better Spotify controls (how exactly is Tesla sorting albums?). I guess Waze, too.
I think if you wanted to own a Tesla and never use the touchscreen while driving, it would be entirely possible although you wouldn't get access to some infotainment features that many other cars don't have anyway. With voice commands, though, a lot of those would work anyway.
Tesla allows you to do all three of the things you stated while keeping your eyes on the road. I can do these things in my Model 3 today.
In the most recent update (last week) virtually everything can be done by voice. You can literally say, “my butt is cold” and it will turn on the seat heater. You can say, “turn up the heat” and it will turn up the heat.
The volume and whatnot can be controlled via the tactile roller knobs on the right and left side of the steering wheel.
I mean, I think it's more of a party trick honestly. I set the AC vents once when setting up the car and haven't touched it since. I set the temperature once a season, roughly.