> The Mozilla team didn’t intend Servo to be a fully functional new browser.

This is not accurate. Some parts of Mozilla thought that way, other parts didn't. And thoughts changed over time. For years Servo was officially an experiment, with many possible futures.

Had it succeeded in rendering the modern Web well enough, I think it could have become a fully functional new browser. Sadly, that didn't happen.

(source: I was at Mozilla at the time, and adjacent to the Servo people, who I talked to a lot)