I do a lot of work with virtual machines at <dayjob>, and don’t have enough room on the internal ssd to hold them all. I usually swap them in and out as I work on different projects, but every once in a while I’ll boot one direct from an external usb3 HDD. I can’t believe we used to work that way. I couldn’t imagine going back. An SSD can breathe new life into a 10+ year old system easily, too.