> It would have been much more useful if you could just mount it like a hard drive without special library management software.

When I got my first iPod in 2006, I immediately put Rockbox on it, where the iPod indeed mounted like a hard drive and files (including all my .oggs, remember those?) could be dropped right onto the device. Never used Apple’s own UI even once.

I still miss the iPod. It let you really immerse yourself in the music without all the distractions inherent in a smartphone. I occasionally considered getting a used one and installing larger storage and a new battery, but by now I think that ship has sailed.