Astrid is much different. Moomins was based on the creator's father abandoning his family to go off on adventures and it's shown in realistic detail. He doesn't change his ways and drags his family along.
Astrid read Miyazaki like an open book and saw him more as child acting like an adult.
Compare that to Disney and PL Travers over Mary Poppins which came off more like a lover's quarrel