Most, if not all, of the accordion players I sold a Tyros/PSR to, were totally satisfied having 61 keys.
Plenty of room for melody.
The synth players were the same.
Piano players wanted more, but grumbled about semi-weighted keys feeling unnatural for piano pieces.
I guess, for the latter, it is a compromise no matter how you look at it...just what kind of compromise would be best.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.