The JS universe moved quickly for about two years. The most popular frameworks at this point have been around since that time, with a few oddball upstarts. They've undergone some big changes, but are at the core the same concepts.

I recall evaluating Ember right around the time they switched from their last pretelease of I think 1.0 and suddenly all the documentation was either gone or out of date and not applicable. I ended up going with AngularJS (1.23 maybe?) and didn't look back until I went to work somewhere that used ember exclusively. It was far less pleasant to use than anything else I had been using up to that point except maybe Backbone.

There's been a few additions to the JS core APIs like webgpu and a few others, but all of them have been extremely niche. There's not much that's been added since 2016 or so that you couldn't pick up in a heartbeat, so it really boils down to the frameworks themselves. Ember lost to AngularJS, then Angular and React.