Third party software such as MCEdit and WorldEdit use "undo" commands so a user can quickly get rid of things they have made a mistake with.
/UNDO would work only with either procedural functions (/fill commands as a simple example) or with elements that require a lot of input to create but only a stray click to delete (NPCs and Boards for example which are way too easy to break). So if you fill the whole area of your castle with stone instead of just creating a wall due to a stray digit in the coordinates you can "/UNDO" to get it back. Or if you are removing blocks around an NPC and accidentally destroy it you don't have to spend 20 minutes recreating it.
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