Only one of those solutions has negative ever-lasting effects though and a bad name definitely does break things.

A broken app can be fixed once, by one developer. A bad name will cause confusion among all developers and waste their time.

Unfortunately, JS already has such shitty names for things that everybody just accepted this. But, they were wrong. They should have definitely broken apps built with mooTools because of the reasons that I stated and also since browsers have already broken tons of sites for lesser reasons such as removing ads.