Drove a Volvo XC40 recently with very impressive tech and few manual switches. Everything can be done via the screen, but also via voice control that appeared to work as intended.
Voice control would be OK as an alternative to manual switches, provided it works as intended and the system can understand different regional accents.
Without voice control, the prospect of potentially having to navigate through menus and sub menus for simple functions such as changing the cabin temperature or direction of airflow while on the move is a bit scary, and dangerous in my opinion. Even if it’s not necessary to navigate different menus and sub menus, hitting the screen in the right location to make the desired change while on the move isn’t anywhere near as safe or easy and pushing a button or turning a knob, which can usually be done without diverting your eyes from the road.
I’m not a technophobe, but I’d take conventional heating and ventilation controls any time over a touch screen for these functions.