The difference might seem subtle, but on Amiga you could refer to volumes as "Volume name": like WorkDisk:. Then whenever anything referred to say WorkDisk:dir/

The difference might seem subtle, but on Amiga you could refer to volumes as "Volume name": like WorkDisk:. Then whenever anything referred to say WorkDisk:dir/file, the system would request you to provide this volume, "WorkDisk". So mounting a filesystem to a directory is not same. When directories are mounted, you need to provide volume first and then you can refer to it. You could name some USB stick as "Important Files": and whenever you copy or save anything to drive "Important Files": the system would ask you to provide this named volume.