I hold the same questions, both as an Android developer and as a Android app consumer -- Sense plays zero part in my development, and as a user while it changes

I hold the same questions, both as an Android developer and as a Android app consumer -- Sense plays zero part in my development, and as a user while it changes the home screen and offers some widgets, it does nothing to change individual apps. Nor does Motoblur, or Sony's Rebecca or whatever they call it, or LG's....