TheLastOne
Person of impeccable tastes (for destruction)
I have only skimmed the arguments above but would like to add my two cents.
1 The entities are only aware of a finite number of universes, don't mean the multiverse is not infinite , when speaking of what is makes sense from a physics perspective, either a infinite amount of universes or just one.
a Finite amount of universes is possible, just not probable.
2 Any precog shard just needs to simulate between one and two hundred planets, hardly universe creation, still just as improbable as actual future sight though.
3 A simulation of our planet could get away with enough shortcuts to not need to be as big as a planet if the computational power is close to a 1-1 correspondence as far as matter simulated vs computer mass goes. Just one example is just enough accuracy in simulating the core of the earth to model surface manifestations.
4 Scanning alternate timelines to make predictions is the least physics breaking way to do so. And if alternate timelines exists then coils power is just to be aware of two at once and dropping one from awareness to latch onto another one. The powers are not for the capes benefit but the entities after all
Actually there are a bunch of theories that predict a finite number of universes, or at least a finite number from the perspective of someone starting in ours, which is a same difference kind of scenario. So... yeah. A multiverse doesn't need to be infinite, or to 'split' all the time.