I wonder how many millions of programmer man-hours have been wasted working around JavaScript's design mistakes that could've been saved simply by putting Scheme or Python (which were actually being considered) in the browser instead.

Opposite, living in a house of cards is when you blindly trust data that comes from user. Regardless of the language. eqeqeq isn't in the recommended linting presets because if you end up needing it, you're probably already in big trouble because of insecure software design.