I would like EQ capabilities in my rack and might think about adding it when I eventually upgrade to bigger rack space. But as noted, without it I have turned to more careful sound design, filtering, arranging, enveloping, panning and effects use to avoid sonic clashes in the final mix (with varying degrees of success).
That Jumble Henge looks pretty compelling, and definitely sounds effective, but I guess I could only use it on things I want to sub-mix prior to hitting my main rack mixer.