Remove Planty Mush and Depth Cells
?
Depth Cells and Planty Mush are two of the six materials found in the Abyss (that being Depth Cells, Tenebris, Planty Mush, Lumenyl, and Scoria Ore). The problem I have with these materials is that they serve to propagate material bloat, being used in only Fathom Swarmer (on their own) for Depth Cells, and Life Fruit additionally for Planty Mush. Depth Cells is otherwise always used with Lumenyl.
Starting with Depths Cells, they're never the purpose of a journey to the Abyss. It's usually Lumenyl, or Scoria Ore, or the minibosses post-ml. They're dropped as you go after other things, and you never run out of Depth Cells you almost always run out of Lumenyl due to the rarity of the latter. There's no real purpose to them besides material bloat and for theme/lore.
As for Planty Mush, they're most well known for adding some plant life to the Abyss and for crafting Life Fruit. However, the Abyss already has it's own theme established through Voidstone, Tenebris, and Abyss Gravel, and Tenebris could easily replace Planty Mush in Life Fruit's recipe. There's already enough variety in the blocks used in the Abyss's creation, so Planty Mush isn't necessary, and it isn't necessary in recipes.
In conclusion, neither of these materials are necessary to the mod as a whole, and can easily be replaced by other Abyss materials. Trimming down on material bloat is important, and these two materials are a good example.
Suggestion by: @pine kestrel