TL;DR: I don't know... Some of them.
Always backed up with some code executions like the ones from Wat, those blame JS for its weak typing. Sometimes also for IEEE754. I assume that this could be challenging for who's starting to learn, but, come on: hardly. Especially on the age of Typescript.
What I see is some experienced but conservative programmers, who might've spent the last 10 years of their lives coding on a platform that doesn't change, and feel like in hell with the crazy forever-changing ecosystem. Some of them are truly bothered by the unstable state of technologies, and some of them are just afraid of being left out of the buzz.
I don't know about you, but, from the products I've developed until now, the ones I'm most proud of are not those with great technical challenges. In fact, it's the CRUD PWA for handling payments on a closed event of a group of mine; the simple report generator used on my dad's shop; a simple browser extensions for my college's system.
Amazing design and modern programming languages are great, I know, but, IMO, the majority of people don't care all that much about it. It's only about how fast you can deliver useful things.