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Oh that sucks, unifying everything under a single umbrella is really attractive.
It's so attractive to us because our brains are literally hardwired to manufacture and maintain hegemonous mental-models of thoughtforms in relation to observed phenomena. We adore symmetrical and elegant explanations for what we see that conform to our subjective experiences. These have been tweaked unconsciously by our brains to create a false sense of congruency of our memories. It's a basic psychological fact that our brains routinely deceive us in order to avoid a state of cognitive dissonance - along with being wrong, this is a mental state our brains tries its best not to be in because it challenges our sense of identity. There are tons of articles and books illustrating this.
In relation to scientific principles, we always want an overarching concept of our unconformative universe that we can easily render and simplify. Something broad enough that it conforms to our brain's need to evolve and morph mental concepts. Unfortunately this universe operates on principles we can only visualize on abstractions like mathematics which cannot be influenced by our dishonest minds attempt to subvert it
But the reason why it's intuitive to unify everything under a single umbrella is because the universe did originate from a single point, the big bang, cosmic egg, or singularity, or whatever you want to call it, if everything did truly evolve from that and our universe cannot be influenced at all by what is outside of it, then at the very origin of it all, everything was unified as one.
Now, if string theory or one of the other unifying theories is right, this might not be case since some things (for example, gravity) is seen as leaking in from outside of the universe (to explain why it's so weak compared to the other three forces.)
But if we just work with the one universe theory for now (or even if there are infinite universes but they are all self-contained) then everything that exists in our universe had to have a common origin from a single point. Once we learn what that was and how to simulate it, we might be on the way to creating our own universes to our own preferred specifications
(like perhaps ours was done eons ago!)