If we're doing the 'showstoppers on the Linux migration', I must yet again ask why no other file manager on any other operating system can do as Finder has been able to do since the 90s and display the total recursive size of a directory in bytes!

The combination of this feature (including sort-by this directory size when listing dir contents) and quicklook makes the Mac the only place I ever want to actually manage files, instead of dumping them in Downloads and declaring bankruptcy. Two basic features that would have me on Linux in a heartbeat. I'm begging you!

(Ironically, Windows Search is so useless compared to Spotlight that the give-up-and-dump-and-search approach works best on Mac too...)