Edit Player NBT
Being able to edit player NBT would open up many options for adventure maps, you can allow players to fly, you can edit their health with perfect accuracy, you can change the player's attributes without needing to take up armor/inventory slots and much more! It's such an obvious idea that I am sure it has already been thought of and is either near impossible or has been rejected. The only reason I can think of it being rejected is that it can lead to some mistakes that the player might not know how to fix or it might lead to crashing/corruption, but I find that hard to believe because "/fill" can lead to unrecoverable mistakes and sometimes even crashing, not to mention how easy it is to "corrupt" a world via a "/tp" command block you forgot to set to conditional.
If it is impossible or was rejected before please tell me why
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