I played with Boot Camp and Parallels when they first came out, but didn't have much use for them at the time. Do most VM's grow storage as needed or does the storage size have to be assigned when set up? What is the advantage of a VM of an older macOS on top of the current macOS vs. simply a bootable partition? Other than, I suppose, fairly quick switching between which I'm less concerned about. If I'm booted into an older OS to use CS6, I will probably be busy there for awhile.