Currently Enhancement Cores are at 999 stacks and I have several of those (don't judge me). They should be made into 9999 stacks in line with the remaining planetary materials in our inventories. This would save a lot of space in consumable inventories leaving room for other things.
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Just put them where legendary shards are and make it a pile vs putting them in my inventory. Currently have 33 stacks of these and counting. But when they made the change to gunsmith parts it was a huge savings in my inventory. Even stacking them to 9999 would save me 30 slots currently. Do phantasmal fragments while they're at it since those are building up as well. Materials and Herealways pieces are already at 9999 so make it at least consistent.