Probably because everyone knows JavaScript, but not everyone use it by choice, giving you a higher than average ratio of people who both dislike and know the language.

This is actually one of the reasons I think every language except for JavaScript sucks for open source web-development. Not that I particularly like JavaScript myself, but everyone knows how to use it. I work for a Danish municipality, we use a lot of open source software, but we’re roughly 10 developers and ops technicians that support 7000 employees and around 300-500 IT systems. As a result we can’t use every tech-stack. This is pretty standard for average sized muniplacities by the way.

We don’t share tech stacks, but we do work together, and as you can imagine that leads to wasted resources. We’re a C# shop our direct neighbour does PHP, because of limited resources, we can’t utilise each others projects. That’s just a silly waste. Good luck convincing anyone to change their overall and often cohesive strategy for tech choices though.

The one technology we can all use, however, is JavaScript and everything build within that ecosystem can be put to good use everywhere. So while the language sucks at a lot of things, it’s also the only universal web language that we’ve got.