>>56419162The spoilers aren't enough to stop most people from enjoying FSN, UBW, and HF. It's totally fine as an entry point for the average human, and you can always get into the VN later (I fucking started with Fate/Extra before I got into FGO and later the VN and anime).
I think Zero and UBW anime is enough just to get people acquainted with the HGW concept to branch out into whatever Fate media they want to enjoy.