Issac Azimov once said that he learned to write when writers were paid pennies a page, so he learned to write the finished product as his first draft as a way to same time and earn more money.
I do the same thing but it took a long time to learn how to say what I want to say with nothing extra thrown in that’ll be removed or changed later.
And I struggled with the necessary self-discipline to accomplish such a task. How to ignore all those little voices in the back of my head telling me to take this or that side trip because it’s ‘calling to me.’
It worked for Azimov and it works for me. I do very little editing and neither did he.
However, every writer is different and every writing process differs from every other writing process and many, many writers would produce inferior products if they used that same self-disciplined method because their best work comes when they take all those creative side trips that I don’t allow myself to take and when they simply let the words spill out however they wish.
Such writers say their best work happens when they don’t use self-discipline. But they do a lot of re-writing and editing.