I don't have a definite conclusion on anything, but I remember having this discussion with a friend a long time ago, and it made me think... What he was trying to convince me was that all of those things you mention can be seen as subclasses of other natural things:

Digital simulations are self-explanatory - All things simulated must have an existing thing they are simulating. Digital is one type of representation of an already existing thing. It can be seen as a subclass of concept/drawing/painting/.

Branching timelines are more abstract, but it's ultimately based on the idea of a tree. Dilemmas over branching decisions have existed as long as we have been able to think. We branch timelines in our imaginations while playing chess or doing any strategic endeavor where decisions and responses to those decisions matter. FFT: Decision tree, binary tree, random forests, etc. These don't quite cover the complexity of QM, but it's hard to ignore that there is overlap.

A nuke is a type of bomb, which is a type of rapid expansion, which is just an expansion of something (volcano, lightning, comets, etc...)

My friend's point was that of course a caveman won't be thinking about quantum mechanics, but they were thinking about the more basic things that ultimately led to their descendants thinking about QM.

Just food for thought.