If you want a heavyweight JS framework, Ember is the most stable and best supported. I enjoyed Ember when I used it in the 2015-2017 time frame.

But I’m abandoning the heavy JS paradigm in favor of htmx. Aside from the fact that I don’t want to duplicate routing and data validation across client and server, htmx is intentionally a single JS file with no build step, so in theory it should run fine as long as browsers maintain backward compatibility.

Fwiw trying to get an old ember app running was an absolute nightmare. On top of that it is way too heavy for my liking. Pretty much polar opposite of jquery.