Yeah I know. I explained myself poorly. The observable itself is lazy and cold. Wrappers functions, observers (like subjects) and operators can add a higher lev

Yeah I know. I explained myself poorly. The observable itself is lazy and cold. Wrappers functions, observers (like subjects) and operators can add a higher level abstraction to change that. It's easy to make lazy into eager and cold into hot, of course, but the observable itself is cold/lazy. Observables can do everything promises can do, but the construct itself, while more flexible, is significantly simpler. Like, -way- simpler. And a lot of what they do and how they do it comes from how they're implemented at the very base (essentially a generic observer pattern). Building observables on top of something else would add tons of overhead/complexity for no reason. The observable needs to be the lowest level piece and we build the rest on top, not the other way around. That is counter intuitive since they can do so much more: the abstractions on top are more like specializations of the low level construct.