Hehe, not everyone. I really like the new icon color scheme and the less saturated/thinner stroke look. But if the alternative is to return to something more like the Rhino 7 icons, that’d be acceptable too. That said, I think there’s no reason why there couldn’t be different icon themes. Grasshopper 2 even does this (as does e.g. TexStudio), where the light and dark mode have different looks on the canvas:
I might be imagining this, but at some point there was even options for desaturating the G2 icons entirely.