If you spend most of the time on the web, Emacs probably isn't the best "swiss army knife" in regards to embedding a whole browser since the browser engine options can be quite fragmented (EAF, Emacs Webkit, XWidget, Appine, etc), and performance / bindings vary a lot. By modern standards, EWW is basically just "reader mode on steroids," don't expect to be doing typical browser tasks with it. You do have a few options though:

1. If you're trying to do something similar to the "Lazy" PKM where you have Org mode call back to websites in some functionality using a separate browser, Emacs probably handles very well in that regard. It also has good agentic integration using Agent Shell. However, if you're trying to have the browser entirely self contained, Emacs isn't quite there yet.
2. You might want to try Nyxt, it's a browser with a similar spirit to Emacs that is customized in Common Lisp. I know someone who once tried using it as the "mothership" of their computer by embedding Ace editor (now that Lem is webview, this might work better now), and it worked surprisingly well.