And this research suggests that a concert pianist who can play the virtuosic repertoire on the modern piano can play that same virtuosic repertior on both types

And this research suggests that a concert pianist who can play the virtuosic repertoire on the modern piano can play that same virtuosic repertior on both types of piano with the same accuracy? Remember, if you're successful in pushing the 7/8 piano you're going to have both sizes in production for at least a century.