Maybe give them a second? Yes, it's usable for applications web views if you're willing to restrict yourself but for general purpose web browsing there's still a lot that needs doing (but work is progressing). Under Google's management, web tech has grown fast. And it's an ever shifting living standard. There is a lot for any alternative browser engine to implement, let alone keep pace with the changes.

I played around with it as a replacement for embedded WebKit in a desktop app. It's getting there!

It's obviously not ready yet, but it's also not "infinitely far" anymore. I'm donating to them, because I think that they're the only realistic successor to the dying Firefox.

Not really. There's a parallel thread on the front page where everybody's talking about writing a browser engine in anything other than Rust is irresponsible, and ridiculous. And yet, no one's rushing to pick up Servo. There seem to be some projects in GTK and QT to embed it, but other than a handful of pretty niche browsers, doesn't seem like there's much use.

Servo has always been a purely reasearch project with no intention to be ever used in production.