Until it's actually time to sell you manuscript if you actually expect to make money.
And for it to be good you are going to need feedback and editing.
You can't be a successful writer in total isolation.
You ether need to by hyper social to promote your own work to a audience or work with companies and middlemen that all have their own expectations and standards.
It's like saying someone can be a profitable musician by staying in total isolation and never interacting with anyone. Which simply isn't the case.
Like any other creative field, to make it as a indie talent you have to master self promotion or you won't make any significant money or have any influence.
I am not exaggerating when I tell you 90% of books published each year sell less than 1000 copies worldwide.
The majority make less than 100 sells.
Actually making money writing is fucking brutal.
If you can't put yourself out there you will never make it. That is why this thread is on the hobby board.
Writing is a rewarding hobby. It isn't a good career for a wizard because it requires masterful social networking ability to make it a career.
Your ideas of the industry are founded in ignorance.
Again just writing a draft is the easiest part.