Ian, I can stick ONE finger down on a MoXS, M3, FantomG, and have an incredible, complex, full band sound come out. In fact, it's why many amateurs have them. They sure wouldn't if you had to build them all from scratch and program the arps and loops like you used to.

That, by your definition, makes them 'home' keyboards. It doesn't MATTER whether the manufacturer CALLS it 'One Finger System' or not. It's what it IS...

And Ian you know, despite your best efforts, that the vast majority of arrangers, even TOTL ones, are used by people that do little more than switch them on and noodle. So what if it is 95% rather than 99%? You are pee-ing into a gale when you consider the overall number of arrangers sold...

I DO think more people use some of these features than some might imagine. But I only think it's a drop in the bucket of those that COULD.
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An arranger is just a tool. What matters is what you build with it..!