I visited the homepages of the 14.8 million sites in Google's Chrome UX Report in October.
I thought jQuery would be dead, but it's still on 53.7% of sites, and it seems to be tied quite tightly to the platform. Webflow puts it on 97.6% of its sites, WordPress on 84.9%. For contrast, React is on 10.6% of sites.
jQuery helped me get into web development, and I guess it still gets the job done even if redundant with browser standards these days...
Ran some numbers - Core Web Vital pass rates:
The jQuery, no React - is mainly WordPress sites, taking that out of the equation:
So outside WordPress, jQuery sites pass more often than React sites.
INP is where React is worse. INP is the responsiveness metric. 95% of jQuery sites have good INP, against 87% of React sites. Probably the cost of large JS bundles hydrating on load, whereas a small jQuery script costs relatively little.
And there's a small group of sites that run both, and predictably perform the worst of the lot with 41.8% pass rate.
It's not something we measure ( yet ) but does seem there's a lot of simple brochure site that really just don't need react, pre-rendering and a lot of the complexity that comes with it, but maybe that's a developer convenience / preference.