I think points 1-3 are valid and certainly contribute to the decision, but many manufacturers believe that the future of the interface is a mixture of voice control (environmental, cabin lighting, navigation etc) and manipulation of steering wheel controls with HUD feedback (infotainment and everything else). Failure to embrace voice interfaces and demanding a button for everything is making 'fossils' out of 20-100 year olds. Source: I work at one of the big German car manufacturers and have mostly drank the 'use voice, don't look off the road' koolaid.