It would be super helpful to have an additional state for content that does not get displayed, and does not load on the published site.

Setting display to 'none' works, but that content still loads (from what I can tell)– which is not ideal.  This would be great for WIP layouts, explorations, and better responsive performance (to not load certain content on mobile devices vs. just not show it... but still having it load).  I know this can be achieved by custom code, but it would be super help to have it baked into the webflow navigator.