Did this episode need to exist? I recognize I’m playing a dangerous game here because arguably no episode of Bravo programming needs to exist. There’s something wild, though, about settling in for the grand finale of one of the most outrageous Housewives seasons on record (at least plot-wise), and it’s just … this. Don’t get me wrong! I secretly love filler episodes because they mean less transcribing 45-minutes of yelling and more pontificating about what kind of snacks Heather keeps in her Prada Monolith boots (my money’s on Chomps Jalapeño Beef Sticks up top and Sour Patch Watermelon down below). But the juicy bits here were all in the preview? We could have just watched Lisa Barlow-Durst lose her religion in Zion, taken a few weeks off to recuperate, and gone straight to…