In Destiny, completing certain actions or reaching certain milestones unlocks unique Grimoire Cards which contain lore tidbits that are often tied to the circumstances through which a player unlocked them. However, players have never been happy with the disjointed way in which Grimoire Cards were implemented.
While the cards are unlocked via in-game means, there’s no way to actually view them from within the game, forcing players to look the cards up either on the Destiny website or the official Destiny companion app. To help solve this issue for Destiny 2, Bungie is opting to remove Grimoire Cards altogether.
According to this recent Forbes interview with Bungie rep Steve Cotton, the studio is opting instead to “put the lore in the game.” Cotton elaborated on that initial statement, saying that discovering the story bits behind each element of Destiny 2 should feel engaging and rewarding:
"We want people to be able to find the lore. All the story is told through the Adventures, it's told through the characters in the world, it's told through the campaign and it's told through scannables you find throughout the world."
With this change, Bungie hopes to make Destiny 2’s storytelling into a more cohesive and immersive experience, and it will likely succeed since players will no longer have to turn to external sources just to figure out the bulk of the game’s narrative.