I reacted mostly to this part:

it doesn't work like "this organism learned something, and **that** knowledge or instinct gets passed down". It tends to be more like, this organism's body was under some specific pressure, or lived in some specific environment for an extended period, and the resulting effect is mostly unrelated and mostly unpredictable.

Where it seemed like you meant specific “learned” traits in one generation are not passed down to offspring, which is contradictory to what is commonly believed by experts. In some occasions it works like you described, but not always. I’m not an expert on epigenetics or even genetics though. And like I mentioned, a lot is still unknown, so we can’t say anything with so much certainty.