In 1.16.2 Mojang changed Ender Pearl barters, halving the chance of receiving a barter, and halving the amount of pearls, making you get 1/4 the pearls you normally would. Beating the game with these chances becomes incredibly frustrating when it takes stacks and stacks of gold for maybe 10 pearls.
This datapack simply modifies the piglin barter loot table to revert the ender pearl values back to what they were in 1.16.1. There were other changes to the loot tables in 1.16.2 which have been retained.