That was true with something like the G1000, but their newer avionics are very much touchscreen in favour of physical buttons. See the G3X or G3000 for example: https://www.youtube.com/watch?v=21eOTAXdXLM&t=18s
Yes, but you can perform the essential functions with buttons on the GTN650 or 750 (or xi). Frequency changes, direct to, etc are all still accessible on physical buttons, which makes a big difference in turbulence.
