True, but, KHTML hasn't been developed now for a decade.

Iirc, the Chrome engine is a fork of KHTML as well.

There's also open source Servo engine, which kinda works ok for specific use cases

And there's Ladybird browser, the first browser with a from-scratch browser engine, it started 5 or 6 years ago and isn't targeting its first alpha until 2027

Those are the 2 closest to being ready for "Average Joe Usage" and they are not even close to being ready for prime time.