The only problem that I have with that pairing it's that is a thing that the series doesn't convey by itself because those two barely interacted together, will be fun when somebody watches Amphibia in 10 years and tries to scroll down millions of twitter posts to get the full context.
But yeah, it was an ok ending, there was some things that I found pretty retarded Anne's clone, the super secret sacrificial spell and the gem god being introduced right in the last second but it still have great moments even if the execution was iffy. Really that's how I would describe the entirety of Amphibia, it's a good show with good ideas but it has a really but REALLY flawed execution and in many parts a shit pacing (god, the earth episodes were such a waste of time).
And yet it was probably the best lore show of the 2010's I will miss it but I agree that the formula of this type of shows is already screaming for a change and I would not mind a little more of variety in the general landscape with more action cartoons.