I saw how you deal with addressing the individual fills randomly. Perhaps his issue was simply placement? I know that, for one thing, you spend a decade getting used to a function being close to your left hand (which is having to chord AND run the style control buttons) and now you have a much larger distance between your chord and the button you need, it can get a bit weird.

I went through this when Roland started using touch screens, and panel buttons started disappearing and moved to the center of the instrument on the screen. Maybe that reviewer hasn’t got fully used to touch screens yet? I must say, I’m not a big fan of how so much screen real estate is wasted on pretty pictures on the current SX OS. They haven’t embraced the screen yet for style control, but I must admit, adding that extra distance your chording hand has to move to get to the screen isn’t ideal either.

I’ve always felt a two screen system, one left, one right, if you wanted to go all touch screen (or at least, transfer much of the style control and voice/style selection duties to screens) was probably the most practical (if not the most cost efficient!). Hard enough to hit those fill buttons and get back to the chording when they’re right by the area on the keyboard you play in! Move them to the central screen, much harder…

Mind you, I did feel some of them were quite legitimate, especially stuff like fewer buttons for style fills, so auto fill is the main way that’s used. Yours is the system that I prefer, and Roland went that way, but Yamaha users (and Korg, I think) have a system where each fill has its own button.

Quite honestly, in normal use, auto fill gives the smoothest most natural transitions, but quite a lot of Yamaha and Korg users create special ‘songstyles’ where each fill is actually a segment of the song, just like the variations. Not being able to call up the fills in any order you want because there’s no panel button for them definitely complicates using them that way.
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