I think there are multiple reasons why JS world is different. - JS libs often target browser as well and that's a fast moving target - JS is primary language

I think there are multiple reasons why JS world is different. - JS libs often target browser as well and that's a fast moving target - JS is primary language of serverless which is also moving fast - it attracts younger devs chasing hot trends - the fragmentation is already there, people got used to it and some even embrace it I lead development on a 12 year old SPA. It's a Ship of Theseus where there is almost zero original code but we never had to rewrite from scratch, instead we were swapping piece by piece as we went. The time investment was reasonably small and we never endangered the business with the full rewrite. I shudder at possibility that someone before me picked "batteries included" AngularJs (the V1). A sibling project is still fighting it today!