New game mode/challenge

I think Mojang should make a new game difficulty along the idea of random structures (like it already is) but add a new structure like a library with a secret enchanting room, a room with an incomplete Wither boss but when you find it a cutscene like thing happens where a wither skeleton would complete the wither using its own head. Something else that I think would be an amazing thing to add would be the Wither Storm from Minecraft Story Mode with a twist that it could only be on Hardcore mode to make it harder to beat in general.