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It would be nice to track who added (e.g.) an attribute or attribute set or category or product (etc.)
Even if only one person is managing these things, it would be helpful to have some indicator of which things they added and which things came as defaults in Magento. In the list this could be just initials if you didn’t want to take up much room (which would be good to avoid).
I believe (though I can’t remember with absolute certainty) that there are some default attributes that are not system attributes. You can delete them, but they’re there by default on a freshly installed system.