If Javascript people were bad programmers, we wouldn't see two new frontend frameworks per year. Many of them are ambitious projects that must have had thousands of hours put in by people who know the language well.

The observation is real however. But every culture develops its own quirks and ideas, and for some reason this has just become a fundamental part of Javascript's. It's hard to know why after the fact, but perhaps it could spark the interest of sociologists who can enlighten us.

There's a reason you don't see two frameworks every year in another language. Being a good programmer is recognizing when a problem is solved and actually contributing to the solution instead of recreating it. Coding a new system can be done really quickly as you're mostly focusing on the happy path. The real work is ironing out bugs and optimizing the performance.