Just My Take !!

Hammond organ, a home instrument ? Maybe , but , there are a hell of a lot of old ( and new ) B3`s being played live.

As for arrangers , you have to not only be able to play , you have to know what and when to push to right buttons.
Breaks , fill-in`s instrument changes , etc.

Arrangers are in many ways MORE pro than a "straight" instrument.

The only time you get a break is at the end of a song !!

Like I said , just my thoughts.

Later ,
Gary 