.localhost Domains

This feels like more work than necessary, I'm not seeing an advantage. Ideally any kind of dev setup should be as contained/localized as possible, but if I'm having to modify OS components, then that feels like sprawl. Or, it's like /etc/hosts but with extra steps.

Yes, I felt like this too. I like that it's cute and how it removes the need to inject ports into any "this is my URL" environment variables, but I agree it does sound like "sprawl." Browser bookmarks serve the same purpose.