Great to hear you are a new PoP fan! I watched it as I thought that He-Man and She-Ra were made at the same time. Plus I had the movies plus more She-Ra than He-Man episodes.
I'm glad that you gave it a chance with an open mind. I personally don't mind if people like MOTU only providing they don't put down PoP to justify their own likes/beliefs about the brand.
I agree with you about the character observations. I could see Mortella only revealing Castaspella's true form as an old lady rather than her being young.
Maybe these might become part of the PoP universe in the future.