All previous theories of the origin of life – Big Bang, panspermia, God, etc. – only pushed the beginning further, did not explain it. There is no mention of the reasons for the existence of life (and everything else that surrounds it).
Same as with psychology, the ultimate limitation of human science is that the observer is simultaneously a part of the object of observation, hence it can’t be objective and/or possible.
Multiverse?! Really? Why not a double-folded universe? Or quadruple-folded multiverse? Theoretical physicists are a bunch of smart guys thinking about nonsense.