even if/at face value you would be limited to pieces composed in the style of and up until the time of composition for the etudes. there has been music composed since then with broader musical and technical language that would require greater facility at more novel technical requirements. Especially as impressionism, serial-ism, an non 12 tone (ie polytonic, post modern neoromantic, etc) modern music makes it's progression.Sam Raphling's two books of modern etudes sought to address these exact short comings of old technical manuals and 'concert works' at exploiting and solidifying an updated technical command of the piano in order to more effectively navigate works into the 20th century.Raphling, Sam. 24 etudes for piano. New York: General Music Pub. Co, 1965.*note the recording and scores are pretty rare I own both but have not uploaded anywhere. There's is pedagogy type stuff on youtube but they are way outside the scope of the above. Raphling's 24 etudes and some of the most difficult music I've laid my eyes on.
Yes, but are they musically enjoyable? Also, do you know if the scores are available? They sound quite interesting.