Something along those lines Vys, yes.
However, right now you can put it to some use for defending - where if you connect everything through root network, and put some root nexus here, root nexus there, Sylvan gate here, and sylvan gate there - you would spare yourself the trouble of having to move your units from point A to point B. The firepower would be the same as if all units were attacking at once, but cannot exceed that firepower above your "all units are attacking at once" mode.
Which units get the attack buff - still beats me, I have zero idea. I could see it being "the first