Yes, I agree that any blueprint/coding asset I’ve seen on the marketplace has been sub-par. Note: I’ve only tried a few, but they were each not actually usable for a shipping game.
Then again, the cost is measured in dozens of dollars, so perhaps that’s as much as you can get at that price for something that only sells dozens of copies…
If I make a “realistic road intersections editor” blueprint, that might sell, what, 10-50 copies? And even if I charge $99 (which would reduce the number of copies sold) I wouldn’t make back the time it takes to build something like that well.