I find about a 10" touchscreen to be optimum. And how well it works is all about how it is programmed. I really like the screen in my Mazda CX 5 but it isn't really a touchscreen all the time. For example when moving, the touch function is disabled. Not a big deal to be as I can go through the menus with their "command knob" feature. What I don't like is how bright it is at night, and you have to go through several menu steps to turn it off. A simple on/off button would have been easy enough to design in.
On the other hand, the touch screen on my Jaguar has to be used for many, many features and it is not very intuitive. The one thing I do like about it though is you can set up your home screen with just your favorite functions and one option is an on/off touch icon that turns off the screen, and to turn it back on all you have to do is touch anywhere on the screen.
Ar least the HVAC controls are all manual switches and dials and can be operated without looking with muscle memory like drivers did for about 90 years prior to all this touch screen nonsense. Kudos to Mazda also for their HVAC controls too.
On the other hand, the touch screen on my Jaguar has to be used for many, many features and it is not very intuitive. The one thing I do like about it though is you can set up your home screen with just your favorite functions and one option is an on/off touch icon that turns off the screen, and to turn it back on all you have to do is touch anywhere on the screen.
Ar least the HVAC controls are all manual switches and dials and can be operated without looking with muscle memory like drivers did for about 90 years prior to all this touch screen nonsense. Kudos to Mazda also for their HVAC controls too.