Comment by TheAmazingRace

Honestly, for me, the loss of resource forks in the transition from Classic Mac OS to Mac OS X was a real sore spot for me. Sure, a UNIX-based OS like OS X was going to facilitate a different paradigm for file handling by default, but Apple really should have found a way to keep resource forks as a thing. I loved how intuitive file handling was in Classic Mac OS. No pesky three letter file extensions driving program associations and the like.