This is actually a good insight and I agree with it. However, I don't think it contradicts the essential statement. The wiggle room is in "however poorly."
So you might want to edit it, but finish the first draft. You might need to tweak it, but finish the first version that actually works.
So you might want to edit it, but finish the first draft. You might need to tweak it, but finish the first version that actually works.