Thanks Paul, pleased to appear to be right!
I have always assumed by looking at the insanely complex converter mechanism that you shouldn't meddle with any buttons when doing a mechanical change!
In terms of force this is common to many other keyboard instruments. Harpsichords are more heavy when you pluck two strings rather than one. Organs (with mechanical action) get more heavy the more stops you use or when engaging manual couplers or octave couplers. I like it because to make a bit more sound it's a musical thing to make more physical effort. It's connects keyboard instruments to the wider family of music making and other instruments. The quelle horreur of musicality is electonica novelties where the touch is identical whatever sound you make and that essential intimate physical dialogue between player and instrument is absent.

In terms of force this is common to many other keyboard instruments. Harpsichords are more heavy when you pluck two strings rather than one. Organs (with mechanical action) get more heavy the more stops you use or when engaging manual couplers or octave couplers. I like it because to make a bit more sound it's a musical thing to make more physical effort. It's connects keyboard instruments to the wider family of music making and other instruments. The quelle horreur of musicality is electonica novelties where the touch is identical whatever sound you make and that essential intimate physical dialogue between player and instrument is absent.