Thanks for that, John. It's always valuable to get different points of view :)

Let me try to elaborate a bit on where I'm coming from.

“Practice until you can practice perfectly" is a fallacy. I agree with that. But "practice makes perfect" is also a fallacy. Practice doesn't make perfect. Practice makes permanent (look up the concept of training scars). So it's important to make sure you're reinforcing the right habits through practice and not bad habits.

In domains where there is a proven and established path toward expertise (such as gymnastics, chess, or playing the violin), you don't have to worry too much about reinforcing bad habits because you can hire coaches who will make sure you don't reinforce bad habits. But in other domains where performance is harder to judge, like writing—and especially if you don't have a coach—I think you're better off not rushing your writing to meet arbitrary self-imposed deadlines—at least in the beginning.

Of course, you still need to publish to get feedback from readers. And I wouldn't advise anyone to not publish anything until they are sure they've gotten it perfect. That would be silly. Audience feedback is what's going to tell you whether you're getting it right or not.

What I am against is people blindly sticking to weekly deadlines, pushing out stuff they know is half-baked just to meet these deadlines, stressing themselves to meet the deadlines, and not taking the time to think things through and analyze what works and doesn't work. And if you encourage beginners to take the whole "publish consistently" too seriously, I think you're making it more likely for them to fall into that trap of just meeting deadlines.

And as to the not quitting problem, that's a different subject. But to me at least, it's a solved problem. I use commitment devices :)