Exactly. If I am working on something and suddenly need more portability, why in the world would I want to suddenly end up in a totally unrelated, different OS?

Exactly. If I am working on something and suddenly need more portability, why in the world would I want to suddenly end up in a totally unrelated, different OS? It would make a ton more sense if it was either running the same OS in both scenarios, preferably not just Android based.