OP, it seems to me that maybe you started both threads to flesh out some of you own thinking. In both threads a number of posters have offered insight, but it doesn't feel like that's genuinely what you want to discuss.
As stated, several Android users utilize iPads. It's actually quite common to see that type of setup. Yet, you post like it's such an unusual thing. It's not difficult thing. The ecosystem works, if you want it to.
Now if this is about having different cables or wi-fi passwords or whatever, well, not a lot that can be done about that.
I consider myself only lightly tech savvy. So, IMO, if I can understand it most laymen can too.