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I think you misunderstood, it's not the Vertiginous Question, it's simply about describing an experiment.
I perform an experiment to empirically investigate something, this process depends on me subjectively experiencing the result of the experiment. Before the observation, the system is in superposition, afterwards it appears to not be in my subjective experience. Collapse theories have to add a postulate that something happened upon observation to change the system. MWI has to add a postulate that some mechanism placed me in a certain branch of the possible outcomes. Neither is necessarily simpler than the other.
Whether other versions of me with their own subjective experience observed something else or not, you need to add that postulate. Their observations are irrelevant empirically, and saying "you actually observed all outcomes" is just factually wrong from an empirical viewpoint.
All results of the experiment will be experienced by a future version of you.
No, this is definitely the Vertiginous Question. The "mechanism" that puts you in a certain branch is the same one puts you in a certain body. Are you also going to demand that neuroscientists answer the Vertiginous question before they can say that other people exist?
That "postulate" already exists if you believe in consciousness in the first place.
Literally the opposite: empiricism requires objectivey, trying to insist that only the things that you personally subjectively experience counts is as far from that as you can get.