Depends on your pattern. I'm a counterexample, here; if something is wrong with a book I am two-thirds of the way through, trying to push through to the end rather than go back and fix it kills it. Everybody's approach is different; so long as you are generating a finished thing at the end, any way of getting there that works is valid. (I have seven novels finished over the past fifteen years, and a number of others still being worked on, including one 450kword manuscript where it's only the end I am tweaking so that would probably practically count as a trilogy with two volumes finished.)
If it works don't 'fix' it. I just wouldn't stop pumping out product. Momentum has a way of pushing you over the finish line.
I can almost attest to that 15 year thing. I've spent about 7 on one book and am half way through. I'll finish it eventually. On the other hand. I wrote over 80% of Admiral Who? and finished the first draft, all in one month.
I just question how many of us will stick it out for the better part or excess of a decade and thus I'm shipping for the gut through it and never go back. Create now, edit later.
But Neurovere is very much correct. There are different models and no one side fits all. Although I do tend to believe that everyone wants to hesitate and take it slow, when they should instead jump in with both feet. I include myself in that assessment.
Just don't let anyone stop you not even yourself, and remember to always follow the dream,
The Deposed King