First, I would like to note that I’m not here to assert any “quantum woo” about measurement and the soul or anything. I don’t think conscious observation has anything to do with the collapse; more likely it’s our method of measurement that affects the outcome. In fact I’d assume these phenomena would exist even in a universe without sentient beings. I’m not advocating for solipsism.

My intuition would be that certain kinds of common interactions (which we also end up using to take our measurements) “cause the collapse” and then: more particles -> more interaction -> more collapse, which would explain the fact we don’t see macro scale indeterminacy but do notice it at a quantum level.

Second, I’ll admit this really isn’t my field. You sound like you know what you’re talking about and have pointed me towards interesting theories and people to look into, so thanks for that, and I’ll defer to your judgement until I have a better grasp on this topic