Command Block as Optional Post-End Game Item in Survival

It would be cool if the final item someone could obtain in Minecraft survival was a command block. The exact method of obtaining it is still open to discussion but an idea I have is that it can be obtained by completing every solo achievement in that specific world so it would be challenging to get. Most achievements aren't necessary to beat the game so obtaining a command block would be completely optional and most traditional players can just ignore this advancement, and even if they decide to obtain the command block they would not be obligated to use it and it can be used just as a trophy like the dragon egg. It would feel a lot more rewarding when fully completing the game, giving the player full creative power of the world, which is one of the central themes of Minecraft. This would change the objective of Minecraft survival into a journey towards full creative freedom. (lowkey poetic)