>>120092149Most sources say it's going back to the toddler roots. 'that show' benefitted from giving depth because it came out before Gravity Falls and before Adventure time started doing that, making it among the first shows in a while, especially for such a young audience, to try it.
Now other franchises can and have done the job of lore and good characters better then they did, it's not as unique, and alot of the internet has soured against them. So the merch benefits are minimal.