Currently, there are these breakpoints
below 1200px, margins get narrower
below 1001px, page tools get auto-hidden
below 1000px, toc gets auto-hidden
Having the toc and the page tools hide at virtually the same time creates a squeeze effect on the content.
You go from wide, to very narrow and then really wide again. This seems not ideal, the content is the most important area, it's sizing shouldn't make such a big jump...
I think it would be better to have something like:
below 1200px, margins get narrower
below 1200px, page tools gets auto-hidden
below 1000px, toc gets auto-hidden
or
below 1200px, margins get narrower
below 1000px, page tools gets auto-hidden
below 750px, toc gets auto-hidden
or even !
below 1200px, margins get narrower
below 1000px, toc gets auto-hidden
below 750px, page tools gets auto-hidden (reflecting that pagetools hide/showing is perhaps a more active decision by and editor than the ToC/menu)
Basically, both sidebars should not hide at the same time, because the content area shrinks from 960px to 500px and then blows up to 1000px (wider than in high width view (without the full width toggle enabled)). I think this transition can be more gradual.