This key size issue seems to be predominant with keyboard players. We learn on an acoustic piano, or a home organ, and that's how we determine what is a normal key size.

My oldest son started on violin. Then he switched to upright bass. Then electric fretted bass, to acoustic guitar, to electric guitar, to banjo, and a mandolin. Every neck was different. Some with frets, some without. Some with 4, 5, 6 or 8 strings. His fingers adjusted.

Horn players have the same challenge.

I think that keyboard players should strive for the same flexibility with their instruments.

Duane