They’re fine for certain things on an evolving menu etc, but not anything where a tactile sense might be needed to avoid distraction. A lack of volume knob is the thing that pisses me off the most in many vehicles, including my own.
Also, power should be a physical cutoff and NOT a soft button for head units. The one of my car is a software toggle and when the system started glitching, froze and also put out high volume noise with no way to kill it except to shut off the vehicle when I could safely do so