IIRC they openly stated in an interview that iMessage is one of people’s greatest incentives to stick to the Apple ecosystem, and they have no plans of shooting themselves in the foot by releasing it on android.

I read a book called Adult Children of Emotionally Immature Parents. My mom is similar, and it gave me a lot of insight into why she behaves the way she does, and how I may have developed unhealthy coping mechanisms as a result. Highly recommend.