>>281368571
Fate/stay night went from being a single-route LN (Old Fate), to a VN with 6-7 routes, to a two-part VN with 4. Fate and UBW were meant to act as part 1 and release right around the time of the finished game, with the Sakura and Illya routes (the antitheses to Part 1's subject matter), coming soon after as Fate/other night.
In the end Nasu wanted to jack up the retail price and get the writing over with, so he stuck the blueprint scenes of the Illya route onto the Sakura route (originally meant to be the shortest route of the VN), and made Heaven's Feel be the third route of SN. In the end, the cut Illya route managed to leave its footprint not only in FSN, but also in FHA, of which its existence is partially attributed to the fact the route got cut