Speaking from personal experience of owning an electric machine or two, I would offer the view that electrically motored machines just do not have the same appeal as mechanically motored equivalents. It is true that often these were the premium models but whilst the electric option might be very rare due to the relatively low numbers sold, the very essence of what made it "special" in its day, no longer exists today. In fact, it is arguably the case that the complete reverse is true. Something mechanical and acoustic seems marvelous to us today and we admire its ingenuity. Everybody uses electrical items on a daily basis and we have come to take this for granted. Therefore the very thing that makes the mechanically driven machine so special now makes the electrically driven item seem more mundane and ordinary by comparison.
I no longer have any electrically motored machines and will stick to mechanical items that can be more easily repaired and show to those of us jaded and even oblivious to the wonders of modern technology, just how simple and effective the earlier technology was.
I also think that if you're looking for improvements in the quality of vintage machines, then you have to ask yourself where does that imaginary line get drawn? If you want electric equipment then why not also by the later electrical pickups and amplifiers instead of acoustically amplified horns? Before long you'll end up collecting MP3/4 players!
