You've completely missed the mark.
The issue was not enhancement materials but the exotic drop rate.
This is almost as bad as throwing a spike grenade at a wall you are taking cover behind right before placing an energy drain at your feet.
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Considering EVERYTHING in the game is going to cost enhancement cores and prisms, it’s safe to assume it’s a good reward change. Not sure the issue there. They’ve also stated they are working on a means to have the exotics drops dip more into the core playlists rather then solely Lost Sectors