Although a lot of the shit in this thread will likely be theoretical:
What do you imagine or calculate based off any theory whatsoever what an alternate reality would be like?
[spoiler:lit]My belief is that realities spreading out from decision wouldn't work given how decision is still predetermined by the reality around us, rather they would have completely different properties. Unless they were developed using similar subatomic structure. For all we know even quantum physics might not even be a thing.[/spoiler:lit]