Most of my list is available as extensions on other browsers [1] (which I'd generally prefer to reduce bloat).
However, in my experience, the DOM for some sites is such a mess that trying to apply user preferences is a hack. I.E. reader view accidentally loses text. Does the implementation Opera has always work? That would be cool, although I'd still avoid Opera for privacy reasons.
Gemini seems to be to throw away all that complexity, which makes user customization easier. I.E. the problem is HTML/JS/DOM complexity, not a browser or its extensions.
