Peronista said: "But what I know - and it's only one opinion - is that this show has terrific performances, all the heart in the world and no real cogent story. The source material always felt like a genius gimmick (cast a woman of a certain age in the role of an accelerated-aging chid) in search of a story. The musical plays like it believes it's a long-running HBO or NETFLIX series where you can dip and dive into different story threads over time: the episode about the dysfunctional parents, the episode about the band geeks, the episode about the new boyfriend, the episode about the check fraud, the episode about the kooky aunt who stays for a month... Trouble is, musicals don't work that way. At the end, the comments above about the final moments not feeling truly cathartic are valid because the audience has not been given a clear path to follow, a clear dream to want along with the main character, a clear triumph or heartbreaking but character-building failure. And it feels like they're riding off into next season's series of new adventures and high-jinx."
I think that's a fair assessment though I think the clear through line is a bigger problem than just having a lot of little subplots. What does Kimberly want? She wants to finally have a normal happy family dynamic and to know her parents love her. She ends the show leaving them behind. Yes, she wanted the road trip but did she want it appreciably more than the tree house or anything else she wrote about in her letter to the charity? I didn't find the ending cathartic or uplifting. It felt nice. Fine. But while the teen romance was sweet, it couldn't ever be too explicit because of the age difference between the actors and it also had about the same level of depth as most teen romances. Learning to like the thing your crush likes (e.g. anagrams) is not a bad thing but Kimberly and Seth didn't seem to have that much in common. Except perhaps dysfunctional family lives. I remember his solo but I can't remember if he actually talked to her about his home life and they bonded over it. Should the show be more explicitly about Kimberly always looking to the future and finally choosing at the end to live in the moment? It's not that it needs a moral/lesson but it does have that TV show feeling where subplots get wrapped up rather than the movie feeling where the character gets what they want/or doesn't get what they want but gets what they need.
The dark comedy/family dysfunction elements are too much like a sitcom to be prestige. Make it more uplifting and target the demographic who enjoys Malcolm in the Middle, Raising Hope, Roseanne, Young Sheldon, etc.