First I must say that's very good that Yamaha is using buttons!
Since I am visually impaired I get more access to the instruments features with buttons.
I have plaied both the Pa800 and the Pa1X and I had very limited access to the instrument. I have also tried the Roland E80 with the same result.
So me and other blind and visually impaired musicians really want buttons, and NO, stupid inaccessible touch screens!