What you're saying suggests that those old codecs were superior to new ones (offering better quality at smaller sizes), which is not a case for most of formats.

What you're saying suggests that those old codecs were superior to new ones (offering better quality at smaller sizes), which is not a case for most of formats. Also the "size bloat" with data from say 40 years ago means little today as space has become so much cheaper. If you have to expand your data from say 70kb to 120kb, which 40 years ago would be a huge deal, today it's something no one will even bother to optimize. And anyway, discussion was not about space economy, but about data being permanently lost, unable to be accessed ever again - which unless the medium is physically damaged is very unlikely scenario. There are always people willing to reverse engineer old formats, just look at the state of retro gaming now. I converted my original ZX Spectrum games from tapes to digital files, and can play them on my modern computer almost 50 years later.