I've also done this a lot, as has everybody. My experience is that there are two problems.
One, it turns out I never ever end up doing the actual steps as I planned to. After a few I have new insights, realize I forgot something, see an easier way, I don't know -- the plan is never followed.
The other is that I really hate working like this because it seems all the creative effort of thinking about how to make something is put in the first part. And then, the rest is still most of the work, but it's the really boring part. It's much more fun (and therefore faster, and resulting in better work) to spread the creativity and the boredom out more equally.
The two are probably related, and it's not inconceivable that I have ADHD.
One, it turns out I never ever end up doing the actual steps as I planned to. After a few I have new insights, realize I forgot something, see an easier way, I don't know -- the plan is never followed.
The other is that I really hate working like this because it seems all the creative effort of thinking about how to make something is put in the first part. And then, the rest is still most of the work, but it's the really boring part. It's much more fun (and therefore faster, and resulting in better work) to spread the creativity and the boredom out more equally.
The two are probably related, and it's not inconceivable that I have ADHD.