Well, all websites are written in JS (on the frontend), so I don’t think that’s fair. And I don’t think 90% of the worst software is made in JS. Even if you’re an Electron hater, Electron apps aren’t bad software, they’re just bloated. There’s tons of shit software written in C. I would guess a lot more than is written in JS, just because more software is written in C. C is also way easier to shoot yourself in the foot.
Uptime Kuma (and others) show that JS can be used to make awesome software. The language doesn’t really hold you back, it’s just your own skill. If you suck at writing software, it doesn’t matter what language you use, your software will be shit.