Originally Posted by Kurald Galain
Make that at least 18, with 20 preferred. Wizards get very little benefit from improving their other scores. Int also governs AC, reflex defense, damage rolls, and your best skills.
For Wizards, yes, but for a general character, 16+ is the minimum, and 20 often too expensive for the benefits. The paragraph you quoted from was general advice, not Wizard-specific