To support use cases like the Factorio Production Statistics screen, every grid should keep track of the input/output rate of AEKeys. To avoid an explosion of tracked entries via NBT, it should only use the fuzzy key (a.k.a. "primary" key) to track. That means all diamond swords, enchanted or not, are collapsed into a single entry in the statistics.

For examples see:
https://wiki.factorio.com/Production_statistics