The larger touch screens, such as on Korg PA900 and Ketron SD7 are wonderful. Saves time and effort, particularly when using the large on-screen typewriter layout to enter names for registrations, styles, etc.
I don't know of anyone who has a larger touch screen on an arranger who would want to go back to all buttons.
The critics are nearly always people who have not tried them.
We aren't talking about phones here. Many of them are too small for my big old fingers, so I use voice recognition more and more.
My concern is that arranger users who are blind find it much easier to operate with the old-style buttons and sliders.