Anecdotal: I asked people why they keep incorrectly using jQuery methods and produce ambiguous, difficult-to-maintain code in the year of 2022. (we still have jQuery as a dependency for legacy code.) The response was that they were not aware that native counterparts like document.querySelectorAll exist in the browser. They just copied the old jQuery code, modified them, and it worked.

I am pretty sure this kind of thing exists in any large legacy codebase.