I'm not sure if that's what the person I was asking meant by "general agenda", considering the change you're talking about (Manifest v3) doesn't even affect Brave[0], or any other Chromium based browser that simply doesn't wish to implement that specific change. Chromium based browsers change their code all the time, and decide whether or not incoming changes will be fully adopted by their browser themselves.

[0]https://twitter.com/flamsmark/status/1088170219695071232?s=0...