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That is, he is part of the very same system that he observes, and moreover his observation ineluctably "disturbs" the system he's observing.... There is a certain sense in which the subjectivity inherent in perception is not reducible to zero. And that is why, I suppose, the uncertainty principle (a/k/a/ the indeterminacy principle) is not confined just to the quantum world, but is a constant feature of Reality at all scales.

Indeed. Even at the root, cognition marks a successful communication which reduces uncertainty (Shannon entropy, information theory.) And if molecular machinery is involved, upon receipt of the message heat is dissipated into the local environment paying the thermodynamic tab. And the cause/effect chain continues.

Where there is an observer, there is life and cause/effect simply by its making an observation even if the object observed is not apparently, directly affected (e.g. quantum measurement v. looking at a mountain.)

Thank you for sharing your wonderful insights, dearest sister in Christ!

That is, he is part of the very same system that he observes, and moreover his observation ineluctably "disturbs" the system he's observing.... There is a certain sense in which the subjectivity inherent in perception is not reducible to zero. And that is why, I suppose, the uncertainty principle (a/k/a/ the indeterminacy principle) is not confined just to the quantum world, but is a constant feature of Reality at all scales.

No, it is not the 'observation' disturbing the system that limits its accuracy. It comes down to one or the other. The more accurately energy is known the less accurately time actually is. If it was possible to know exactly the momentum, position would actually cease to exist.

It is also the same reason why an electron doesn't spiral in to the nucleus. Nature doesn't allow both the position and momentum to exist with 100% accuracy.