The author cites Bezos to draw the line between when first-principles thinking is worth its cost and when it isn’t: “Some decisions are consequential and irreversible or nearly irreversible. These decisions must be made methodically, carefully, slowly, with great deliberation and consultation. If you walk through and don’t like what you see on the other side, you can’t get back to where you were before.” Those are Type 1 decisions — first-principles territory. Type 2 decisions are reversible: “You can change your mind. For these, go fast. Use analogies.”
The author names the misallocation as the actual error: “The mistake is applying analogy thinking to Type 1 decisions. Or wasting first principles thinking on stuff that doesn’t matter.” The implication is that thinking-mode selection is itself a decision — and one that lives upstream of Reasoning by analogy has a ceiling — you can never get beyond what already exists by copying what already exists. The ceiling only matters if the decision warrants going past it; for “what should I eat for lunch?” the ceiling is fine. The diagnostic before reaching for either mode: ask whether you can walk back through this door. If yes, analogize and move; if no, decompose and verify each assumption before committing. This pairs with Circle of competence determines where you can win — knowing what kind of decision you’re facing is part of knowing yourself.