Ah, didn't know how old that doc was. Opera only switched to Chrome in 2013 or so.
But yeah, I agree. That's why I support Ladybird's and Servo's development. They are the best bet to help stop the duopoly. If only Opera would BSD-license and open source their Presto Engine I would love to see someone pick up development of that. Instead we get Opera putting jumpscares in their browser .
Well Ladder is written in Go. 13ft is written in Python.