> I see no indication that current human intelligence is at anything close to a historical pinnacle. Human knowledge, yes, but intelligence? No. Collectively, we're dumb and trending dumber

Just mathematically speaking, collectively we're at peak population levels, so the total collective intelligence (sum of all individual human intelligences) is likely at peak as well, even accounting for individual dumbing down?

Also, I think we (non-scientists) might be overestimating the average historical intelligence - see Flynn Effect [1] - perhaps because of a bias in our perception of the past levels based on who published books and thoughts - basically more intelligent members of our species.

  > and the tendency towards lazy thoughtlessness which AI engenders

May I suggest these historical references [2][3][4][5][6][7] as a counterpoint to AI driving lazy thoughtlessness, which rather seems to be innate to humans as a group.

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[1] https://en.wikipedia.org/wiki/Flynn_effect

[2] Thucydides, History of the Peloponnesian War, 1.20 — 5th c. BCE Greece. “So little pains do the vulgar take in the investigation of truth, accepting readily the first story that comes to hand.”

[3] Aristotle, Rhetoric, 1.2 — 4th c. BCE Greece. https://kairos.technorhetoric.net/stasis/2017/honeycutt/aris.... Aristotle treats public persuasion as necessary partly because ordinary audiences cannot easily follow complex chains of reasoning. He says rhetoric addresses deliberative matters before people “who cannot take in at a glance a complicated argument, or follow a long chain of reasoning.”

[4] Plato, Republic, Book V — 4th c. BCE Greece. https://topostext.org/work/768. Plato distinguishes philosophers from the many “lovers of sights and sounds,” who enjoy appearances but do not apprehend deeper truth. The text says their thought is “incapable” of grasping the underlying form or nature of beauty, and that few attain that deeper vision.

[5] Confucius, Analects, Book 2 — 5th c. BCE China. https://www.chinastory.cn/ywdbk/english/v1/detail/20190722/1.... "Learning without thought is pointless, Thought without learning is dangerous".

[6] Buddhist tradition, Dhammapada, Appamāda-vagga. https://suttacentral.net/dhp21-32/en/sujato. Dhammapada contrasts heedfulness with heedlessness, treating heedlessness as a central human failing. In one translation: “Heedfulness is the state free of death; heedlessness is the state of death. The heedful do not die, while the heedless are like the dead.”

[7] Francis Bacon, Novum Organum, “Idols of the Mind” — 1620. https://history.hanover.edu/texts/bacon/novorg.html. Bacon argues that the “Idols of the Tribe” are rooted in human nature itself, and that human understanding distorts reality like a false mirror.