[moron4hire]

I think it's largely a three-fold problem of the fact that most JS apps are still deployed through browsers and not installed, the fact that HTTP2 was not the panacea of multi-request happy good times it was made out to be, plus the fact that there is no Application Binary Interface, everything gets deployed as source code.

This creates a situation where you need bundlers, whereas other languages don't have the concept at all, just to be able to minimize download time (and honestly, while we end up making rather large apps in comparison to web pages, they're pretty small in comparison to other kinds of applications), and then bundles are too opaque to share common code between applications.

And because there's no chance to benefit across projects from sharing, there's no force driving standardization of bundling, or adoption of said standard.