Maybe its because I'm a Scot and apparently have an accent, but I'd say that voice control is by far the worst means of controlling anything.

Good lord, no. Voice control is the worst possible UI, because it’s just as easy to flub or mumble or be misunderstood as it is to aim wrong on a touchscreen. It’s far more vague than actual buttons, knobs, and touch screen controls. How to even describe what you want is a challenge, or even knowing what’s possible. Plus if you are listening to anything or have other people in the car, it’s incredibly disruptive, not to mention the risk the car will misinterpret something actually being said.

Agreed, I use scroll wheels on my steer for volume and next/previous song. Voice control for temperature & navigation and if an text comes in do a quick reply.

Honestly I barely feel the need to use the touch screen in my car while driving, and if so I always make sure autopilot/high way assistant is turned on as extra safety.

No. Pressing a button will give you the functionality you want 100% of the time. A voice command won't.

I'm not sure they would work well if you're listening to loud music or something. Personally, I don't think I'd ever buy a car that uses voice control as its primary interface; I greatly prefer physical buttons.