I don't know if I agree. I recently tried Webflow and was not so impressed. It's basically a UI on top of CSS. Which is OK for developers, but there is still too much complexity and too many footguns for non-technical users.

For example, take position: sticky. This CSS property is basically one-to-one mapped to a dropdown in Webflow. So I thought it would just work. But alas, just like the CSS pendant, it only works if the parent element has the correct properties. Also it only works in browsers that support it, and isn't polyfilled automatically.

Maybe what I'm asking for is technically not feasible, but then the UI should disable the option in such cases and not hide this in a support page imho.

I think a truly powerful website builder would have to leave the CSS paradigms behind and invent something new.