61 key might be:

Smaller screen

Buttons instead of sliders and button real time controls

Really no weight difference? Currently my Genos is just a few pounds heavier than my S970.

Keybed quality?

And there is a 61 key now...S975...😊

with 42% yes for 61 Yamaha is smart to make a GENOS 73 key to satisfy the masses like NORD did...
great Poll..

I'm not voting, but if I were to be in the market it would be if the keys would have a lighter touch. I would prefer 76 notes, but my aging fingers and wrists are starting to protest even the semi-weighted action after 3 or 4 hours. And then it would have be priced nearer to PSR.

I have been using Arrangers from a LONG time ago now, most 61 keys with some exceptions, the Ketron SD1 basically....and now with the Genos...that is 76.
Having said that, I do not know if is because of the smaller footprint in Genos vs T5 76, but, the first week it took some getting used to some controls mostly for the drastic user interface change, that now I love.

I find myself "at home" with the 76 keys, and I do NOT think that I could get back to the 61 keys, I like the re-newly re-discover key range, I no longer have to hurry up to either change the Octave or make a change of registrations with the adjusted octave range....it "flows" more naturally.