> I code in a tiny subset of JavaScript, wrap at 40 character width, without allowing any build tools, and only single-file repos. This probably seems insane to most, but it has a powerful effect: Complexity becomes painful very fast, and so I am forced to refactor aggressively, which causes me to put more effort into good separation of concerns earlier in my implementation process.

I like this idea! I've sort of gravitated toward it myself -- inspired by the exceedingly clear pieces of code that can be found in older books on programming -- but I have yet to make it an expölicit purpose of mine. I may want to try that!