admit that all the worlds exist, noting that worlds splitting via decoherence is implied by the rest of the physics.
If “all the worlds” includes the non classical worlds, MWI is observationally false. Whether and how decoherence produces classical worlds is a topic of ongoing research.
If “all the worlds” includes the non classical worlds, MWI is observationally false. Whether and how decoherence produces classical worlds is a topic of ongoing research.