.. I don't have the expertise either, but we've all got to choose who/what to emulate, what to aim for in our playing, so I make up an amateurish opinion and hope!
Yes, future generations will be able to study the 20th C onwards with far more clarity than we can see the 18th C; recording technology is a good thing.
Harpsichords; I'd love to see what they're like when well-set-up! Our school harpsichord (a long time ago, and we were lucky to have it) had a tail-end rotated 30 degrees one way, and a keyboard rotated 15 degrees the other. I'm guessing that wasn't the way it was designed.
Anacrusis, maybe it's the lack of a curly wig that is getting in the way of my developing a proper French pout. Pah!