I didn’t because I don’t have anything worthwhile to add to what you have said. I am a classical singer, so I don’t have any non-classical purposes for recording; I have only done about ~10 or so recordings, none with digital keyboard. In every case, one of the first questions about the recording venue would have been ‘What’s the piano like?’, and decisions would have been made based on its quality. None of the pianists with whom I’ve recorded would have considered working with a digital piano, so it’s rather a moot point.
So I have nothing to say about your digital super piano.
I think the Yamaha is much closer to ‘the digital piano that is going into most people’s homes’ than the 30 gigabyte per sample keyboard that you’re speaking of. My Kawai is a very good value for the money, but as I’m sure you know, it is nowhere near a top-notch instrument and is not considered ‘concert quality’, even by Kawai itself. We bought it for $15K when it was 9 years old; it’s about 12 years old now and was used by a friend who is an opera coach.
We got the Yamaha while we were between houses; it served as something to practice on in the apartment, and while we waited for the renos to be finished in the studio of the new house. (I did NOT want the Kawai in the house while there was still drywall dust floating around.) I’ve kept it because a) the chamber ensemble with which I occasionally sing does community outreach concerts in homeless shelters as a final stage of rehearsals and b) it has been useful when both kids wanted to practice at the same time.
Frequently I’ll be out of town for 4-5 weeks for a show. Sometimes, I rent a digital piano; sometimes, I make arrangements to play a piano that’s available at the theatre or at the local university/conservatory/music store. So I’m familiar with the advantages of having something there in the hotel room with me, where I can use headphones and practice drunk at 3AM without disturbing anybody. But my best progress has always been when I’ve been somewhere where I can play a piano that inspires me, and those shows stick in my memory. Stirling Festival Theatre, Man of La Mancha was where I got to practice on a Boesendorfer for a couple of hours a day. Edmonton Opera, Traviata, La Boheme was where I got to practice on the Steinway in the rehearsal hall before or after hours. Winnipeg Centennial Concert Hall, also a Steinway, which was the main concert instrument for the Winnipeg Symphony. Whenever possible, it is a great thing to have an instrument that inspires you to make use of the fresh possibilities that it offers. Yes, I play pretty well for someone who has only been studying since 2004; no, I’m not likely to become proficient enough to play much higher than Grade 9 Royal Conservatory of Music repertoire. That doesn’t mean I can’t appreciate a good instrument.
So to use cars as a metaphor for a moment - it doesn’t surprise me that practical family cars like mini-vans outsell sports cars like Lambourghini or Jaguar. It also doesn’t surprise me that between upkeep and insurance, many car buyers would pass up on a bargain priced sports car in favour of the Dodge Caravan. What surprises and saddens me is that, even for free, people are deciding to junk pianos because they can’t find anybody willing to take them. It’s as if Jaguars are being crushed into cubes because nobody wants them. Makes me sad, and it underlines that my values and the values of the world at large are diverging, that’s all.