I don't think you read the sentence you're responding to carefully enough. The antecedent of "this" isn't "coding agents" generally: it's "the value of an agent getting you past the blank page stage to a point where the substantive core of your feature functions well enough to start iterating on". If you want to respond to the argument I made there, you have to respond to the actual argument, not a broader one that's easier (and much less interesting) to take swipes at.