I live and learn.
I’ve always played closed flat keyboards (Hohner etc) and most of the recieved wisdom is that this type of keyboard best suits Irish playing.
I recently came across a very good box with a stepped open keyboard at a price too good to miss and bought it despite reservations about my ability to adapt to the keyboard which seems to be based on a typewriter.
To any players who are playing flat closed boards and wondering about the alternatives I would now offer the following advice: get an open stepped keyboard if you feel the urge.
It took me about a week to adapt to it, and I find that in addition to being able to play the new box ok or better, I now play the flat closed keyboards of my other boxes more crisply than before. I can’t put the new box down.