What about in the case where it's already known that there is a product-market fit? When Pioneers leave an absolute mess in their wake, changes to the project

What about in the case where it's already known that there is a product-market fit? When Pioneers leave an absolute mess in their wake, changes to the project take more and more time. There is a trade-off, and the "immature pioneer" mindset (working with no thought for the future maintenance of the code) can make the scaling / maturing process of a product needlessly painful and slow.