Buffet world. Doesn't this imply the selection of multiple, specific biomes rather than just one? I'm getting really tired of not being able to play Minecraft Proper in a warm ocean floating island world because Strongholds will not spawn. If I could select multiple, which I believe is the intended purpose of Buffet, this would be one solution. Another might be to override certain necessary structures.
For example, the floating islands in the Warm Ocean biome still have grass, dirt, and even trees. A recent bug fix even allowed for passive mob spawn. What's stopping Mojang from making an exception for Stronghold Spawns?
This is a feature request. It belongs here https://feedback.minecraft.net