I love the metaphysical implications of modern physics.
If I recall correctly, the multiverse was theorized as a way to get out of the implication of quantum mechanics that reality is probabilistic, not deterministic.
String theory implies universes with 11 dimensions. Holy smoke!
Let's face it, modern physics, cosmology, abiogenesis are just freaky topics which provide fertile ground for dummies like us to engage in arm waving.
Absolutely.
I don't pretend to have even the most tenuous grasp of any of it.
But it's fun to imagine.
I like to imagine that every person who's ever lived has had not just his/her own reality, but several realities that branch off in different directions at crucial points within their lives.
And that these realities continue on and on until every infinite possibility has occurred.
And they are all occurring simultaneously.