The biggest issue arose when they began making VNs complex with multiple parallel romantic routes, back in 2019 when this idea started it was simple because it was in its early stages, but after 10 chapters, the complexity starts to hinder any project. Look at Hillside, even halfway through, the script of the chapter is the same length as the previous one. And the worst part is that each route becomes so segmented that the player feels the update is short because each LI had to have their story divided with the others within the Project.
So Daniels K, for example, prefers to conclude some secondary romantic routes before the actual end of the game, so that these romantic interests don't interfere with the main storyline.