Crosscode was amazing and is a pure JS/canvas game. I dunno I've fiddled a bit with some engines, but the tooling/docs are pretty lackluster compared to unity/godot
Default angular builds are large compared to other frameworks even when you consider all the extra stuff that gets bundled with angular.
5MB is large for a single bundle, I'd say if you are using lazy loaded modules 2MB for a single module is large.
Front-end performance varies in importance based on your context. In e-commerce performance is tied to conversion so it's very important. If you're a government contractor building CRUD apps, it's not as important.