(Obviously, MS will maintain their own fork and can permanently fork away whenever they want/need to, I guess, so it's not like they've locked themselves in forever, but still)
I actually wasn't aware of the problems with Edge. This is the first I've heard of them... I hadn't heard much about it from either devs or users, so I assumed lots of people were more or less happily (or at least uneventfully) using it as Windows' default browser.
Never thought I'd be sad to see Internet Explorer (or its descendant) bite the dust, given what a plague upon humanity IE was for so many years, but I'm not sure this is the happy ending we might've wished for.