Another feature that CAD blocks have that ArcGIS should have is that the block symbology can be stored within the CAD drawing itself. So if you create a custom symbol in your ArcMap document and then share this MXD document to someone else who doesn't have this symbol saved on their computer, they could still see this symbol in the map, use it, modify it, and save this symbology in a separate file along with other saved symbols. Using cartographic representations to store custom symbology only in a geodatabase is quite a limitation.
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