When I started using Emacs, it was still written in teco. (I did use raw teco once.) In all that time, I've NEVER customized or configured it. That was a hug

When I started using Emacs, it was still written in teco. (I did use raw teco once.) In all that time, I've NEVER customized or configured it. That was a huge advantage when I was working very closely with other people - they could use my Emacs session and (mostly) work and I could grab theirs and always work. "Never" is not quite true. I borrowed someone's customizations for a year or two, but they weren't worth the hassle to move them to a new machine so I went back to "no customization." Every few years, I ask "wouldn't it be nice if Emacs did {something}". I then find that someone implemented said something, and it's in the released version.