When i compare my Tyros 5 to some serious keyboards like the Kronos and the Motif it allways strikes me how simple and intuitive the UI is. But then i am a technician, which might make me look with different eyes.(i think the Motif series would really bennefit from a lot of the simple UI of the Tyros)
In this age of technollogy certainly a few buttons more or less would not make a difference.
Do they have an ipad? or are they afraid of the icons they need to push?
just kidding, all technollogy needs an addaption periode, a periode of getting used to it. But most often a good tutorial by a friend works miracles...