I'm not making any claims about programming practices

If someone comes out saying "you guys are all doing this wrong" and yet they can't finish their own project then why would I take their advice seriously?

If you suggest a way of doing software development and you can't even show it working out to completion, what does that say about your proposed methods?

It's not really the same. Casey is suggesting people that don't spend 10 years crafting everything from scratch are somehow "lesser than." The user you're replying to is pointing out that Casey has set a completely arbitrary rule for game quality that conveniently leaves out his inability to ship something, and that's funny.

We're not saying games taking longer than a few years are failures, we're saying good games can encompass both approaches. But Casey, and his followers, are doing purity tests to feel good about themselves.

And this is assuming the games they ship are even good or noticeable to the user. I don't much care for Braid or The Witness, and I don't want my favorite dev studios to suddenly write everything from scratch every time. I would have a lot less fun things to play.