Python allows you to focus on a single concept in isolation (building on what you’ve already learned, of course). JS has a bunch of other stuff mixed in. Like the DOM. Interacting with the DOM is necessary for any browser code. You can hide it with abstractions and boilerplate, but it’s always going to surface in error messages. Debugging JS can be quite a bit harder than other languages.

Caveat: beginner JS is many years behind me. It may not be as bad as corporate code full of react and angular and all kinds of requirements.