I guess I don't view "intellectual growth" separately from "personal growth" (perhaps I should?) And I view personal growth as a kind of chemical reaction, where the input ingredient in smallest amounts is the limit to how far the reaction goes. In (modern, Western, internet-enabled) society, intellectual insight/knowledge is usually not the limiting ingredient. The limiting ingredient is generally the motivation to get work done. Without it, the standard failure mode for "too much insight" is online wankery, basically.