I wish I were born 150 years earlier because I can get to watch the composers perform works and concerts. It'll be wonderful to see them pianists compared to modern greats like Argerich and Kissin and see what they would like their works to sound like. But yes the 1960s-1980s would have been awesome. Most if not some of the legendary recordings we hear today were made back then. JL
I'd be impressed. It'll be interesting to have the composer first play their work then another pianist from this time and have a discussion about stuff. What makes you say that the compsoers took a lot more liberties when it comes to interpetation? There are not a lot of primary sources that tell about the performance of pianists in the Romantic period ( corrent me if I'm worng which I most likely am). Interpretations would maybe be a little different to what we are used to hearing but we can't prove that. JL
Very few players today would dare to do really unexpected dynamic or tempochanges.