Interesting question, Don:
I am not a pianist or musician. For my needs, I could get by with even fewer keys on the 970 you sold me. I can fully understand how a real pianist would want a full 88 keys (or even settle for 76) but I prefer better sounding styles, intros, middle breaks, outros and multi-pads to enhance the songs I write. As I've said many times before... Arrangers are the best kept secret that most songwriters never hear about.
Have a great weekend, Pal!