One unique feature of the Amiga that I've not seen referenced here is that programs, scripts etc. could reference removable media by label and if the media was not in the drive when needed, a Kickstart-managed requester would pop up asking for it to be inserted promptly. This made it very easy to manage even a single-floppy-drive system. Linux could support this even now, as all the required pieces are there (e.g. automount support) and it would be quite useful for a number of things; however it doesn't, AFAICT.