I'm all for the "weirdness" but I have to admit, I'm pretty firm on the Allies Matrix rules when I play against someone, whether Unbound or Battle-Forged. If you want to mix Blood Angels Death Company with Tau battlesuits, or Dark Eldar (with lances) with Imperial Guard mechanized units (tanks and Chimeras), then yeah, I'm going to hold to the rules about deployment and rolling if they get too close. You want to mix and match, that's cool, but use the restriction that's meant to somewhat balance it. I'm not a hypocrite, either, I do it when I mix Imperials with Orks (I have Blood Axes, and they used to even have IG in their army list).