Sandboxes with the right persistence and http routing make excellent dev servers. I have about a million dev servers I just use from whatever computer / phone I happen to be using.

It's really useful to just turn a computer on, use a disk, and then plop its url in the browser.

I currently do one computer per project. I don't even put them in git anymore. I have an MDM server running to manage my kids' phones, a "help me reply to all the people" computer that reads everything I'm supposed to read, a dumb game I play with my son, a family todo list no one uses but me, etc, etc.

Immediate computers have made side projects a lot more fun again. And the nice thing is, they cost nothing when I forget about them.