https://www.gamespot.com/articles/destiny-2-dev-admits-it-betrayed-players-with-secr/1100-6455276/

Bungie has responded to the recent controversy surrounding Destiny 2's XP mechanics. If you're just catching up, players discovered that the game reduces progress toward levelling up when you earn XP rapidly as you do in Public Events. The developer then disabled this XP scaling mechanic, and now the studio has responded further, acknowledging that it "betrayed" players in terms of transparency.

"Our intention was to keep slower-paced activities as rewarding as high intensity grinding without confusing variations in displayed XP values, but the silent nature of the mechanic betrayed the expectation of transparency that you have for Destiny 2," Bungie wrote its website.