With this pack, you unable to hit mobs while holding certain items like feathers, string, powders, coral, leaves, flowers etc

But you can also do slightly MORE damage by holding items like flint, amethyst shards, prismarine shards, dripstone, arrows, etc

Did I go through and write a command for almost every single item in the game?

Yes.

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This change is included in my RL Megapack posted here: Aceplante's RL Megapack, but I also wanted to post it separately in case anyone wanted this specifically.