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But they are all observed, that's the point.
By who? If I measure the spin of an electron in a superposition of up and down, I only ever get one result, up or down.
By the versions of you in each branch.
But which one am I? You postulate that "I" am somehow split into endless copies upon observation, but also "I" am only one of those copies somehow chosen at randomly according to the wave function distribution. So "I" see all outcomes of the experiment but "I" also only see one of them?
This is where it stops being simple to me.
What you are describing is essentially another facet of The Vertiginous Question - why am I me instead of someone else. Importantly, this is a problem that exists regardless of whether MWI is true or not, so the lack of simplicity already exists, like it or not.
Before you were born, the future contained the creation of a vast number of conscious beings, but only one of them would be "you", seemingly chosen at random.
The branching of the observers wave function is exactly the same situation.
It's a question about Philosophy of Consciousness, which is well and truly outside the purview of Quantum Physics. From the scientific perspective it's perfectly logical and sufficient to say that "there is one observer who will split into many, each of which will have its own perspective that is unaware of the others".