Probably because it should be quite rare that you would ever need to do that. The checkboxes are designed more for permanent assignments to things that aren’t really part of the output, like chapter notes.
Secondly, such a device as you describe would not allow for partial changes as discussed above (though I see it was not mentioned that one can select some items in the Outliner or compile Contents list and then Opt/Alt-click within the selection to have it constrained by that). Mass toggling everything in the entire draft folder strikes me as something hardly anyone would ever want to do. If you don’t want to compile anything, then why compile? 