Quality of feel has nothing to do with what it is made out of, (Even paper can feel superior to metal) but how it is made and the quality of the materiel used, (Always has done, always will be) so nothing new.

Korg has never had a domestic line, the PA was just an offshoot of the pro line, (Hence they tend to use stage materials (Which still features wood and metal) as that is what they are used to) whereas Yamaha have always had a domestic line, and as arrangers have always been designed for the home hobby player (Hence the amount of pro users is negligible) where it is stuck in one place forever, different rules can apply. (Let’s face it a lot of the stuff made in the world that used to be made out of metal is now made out of plastic, so nothing new really)

Bill