I wish we could've gotten a HW story without Fionna since I'm way more interested in HW. Simon made more sense to hang with Fionna and Cake since he had a connection to them via being Ice King. The only connection HW has with them is that Fionna is a different version of Finn who she already has experience with. You could tell a similar story with HW without the multiverse stuff and have it work well by itself. Fionna's current character doesn't have much room to grow, she already had a completed arc in season 1. The only thing she seems to have going for her is that love triangle between Hunter and DJ Flame. I just don't have much interest in Fionna anymore which was my biggest fear coming into this season. I wasn't sure where they could go since season 1 ended so conclusively and it doesn't look like they have many answers.