Mainly, HDDs are bigger and FLAC is future-proof for future audio formats, as well I think the death of What.CD has really impressed upon the next generation that preservation is of utmost importance. A lot of albums were fully lost during the transition to RED/OPS, and a good chunk of albums that used to have a lossless copy now only have lossy versions from those who kept MP3 libraries. IMO, piracy is ownership, and owning the master lossless copy so you can generate any other formats is that concept taken to its logical conclusion.