And that is actually as old as Mac itself, only it used to be even more intuitive because the application was a single file on an actual disk instead of a disk

And that is actually as old as Mac itself, only it used to be even more intuitive because the application was a single file on an actual disk instead of a disk image. "Installation" didn't even really have much meaning, you had applications and you had disks and applications were just another thing that could be on a disk. I miss this.