One would hope you could tell the car to change radio stations, switch to the phone for music, or even control the temperature, but for now we get limited navigation and satellite radio commands.
Would I use them, some. However the point was, they don't focus well. Fart gags and video games are not features that make every day driving easier. Having full access to the music on my phone via blue tooth like nearly every other car has had for years would be. Instead I have to use my phone to change play lists which actually is not legal in my state.
From what I read the only way to control most of the things is through the central screen, which can be a pain compared to dedicated knobs. "Hey tesla, fire up the A/C" seems better than having to touch/look at the screen.
The games/jokes are probably not built by the same teams anyway. It's more of a PR thing.