It comes from 27 episodes of real character development that made folks care about the (majority) of Twin Peaks residents enough to want to see them engaged in this Return, not be set decorations to be pointed at when hey happen to pop on screen every three episodes "hey look, it's Shelley!".
And for me, it's not even so much that we don't get any real exploration of where these people have been or what they've gone through in the last 25 years- it's what it's being replaced with that's much more frustrating. Instead of discovering just how fragile Sarah Palmer's state of mind is these days, we are treated to full length musical performances. Instead of discovering what happened between Bobby and Shelley, we get to watch someone sweep a bar floor for two minutes straight. And most infuriating of all, the "Lynchpin" of the entire Twin Peaks Saga, Dale Cooper, who is the very reason we've wanted to go back and find out just what the fuck happened, walks around in a complete stupor episode after episode while we literally shout at the screen "wake up!!! WAKE UP!!"
I 100% realize I'm going to get flamed, all the Lynchians dismissing my thoughts because I'm clearly not operating on the same advanced level of consciousness that they and David Lynch are, but I've just about had enough of this show. It's just bad, compared to the original series, EVEN MID-SEASON TWO, this is just fucking bad. I was hoping for the twistedness of Fire Walk With Me, as that's what pulled me into the TP universe to begin with. Instead I find myself staring every week at someone's student film project that nearly every scene tries to make you dislike it. It's finally worked for me.