This is a very nice resource — the use of Autoprefixer and the SUIT/Montage class names is welcome as well. I see a lot of impact in flexbox for progressively

This is a very nice resource — the use of Autoprefixer and the SUIT/Montage class names is welcome as well. I see a lot of impact in flexbox for progressively enhanced designs — designs that in their most basic form have simplified or single-column layouts — where most of the layout is handled by supported browsers. Do you imagine it's better to make a clean break and just depend on pollyfills/float-base `.no-flex` backup styles though?