Keep in mind Rust wasn't even 1.0 until 2015, so servo was being developed in tandem with that, from 2015 to 2020 they integrated stylo from servo to firefox, a

Keep in mind Rust wasn't even 1.0 until 2015, so servo was being developed in tandem with that, from 2015 to 2020 they integrated stylo from servo to firefox, and a few other components if memory serves. So no, I guess they didn't bring an entire re-write to market in that time, but I don't think you can attribute any of those failings to language choice.