Maybe I don’t get it? I look at the list of features Apple is removing and they all seem like things I wouldn’t want a web browser to have to begin with.
Not a browser, but a PWA. It's a web page, which you can "install" as an "app". Features like storage, background tasks and notifications are important for many applications, for example a messenger. These were available, and there is a market for those, but Apple has decided to kill that market.
That's what I meant: they could continue offering safari as a "basic web browser" but allow actual web browsers in the appstore, that can fully implement any web APIs.
This is probably not accurate given I was mistaken above but I thought that's what Apple was doing. You can load any browser but some OS APIs are going away.
If only Apple just removed them from Safari, and allowed other browsers to compete...