I played D2 since launch, but Lightfall was the final nail in the coffin that made me abandon the game.
They sold us an expansion that was the most expensive one they'd ever priced, was the most lacking in content (with half cut-out and sold separately in dungeon and raid passes), with a completely shitty and forgettable story, with the single worst voice-acted character in the history of Destiny (yes... even worse than Phoned-in Peter Drinklage from D1).
They inexplicably jacked up the difficulty of the game, which made doing even the basic activities a chore, and made what was already a grindy-ass game, into a fucking absurd grindfest on a similar level of Korean MMOs.
And to make it even worse, the story went nowhere and ended on a cliffhanger wherein nothing of any real value even happened.
From that point, it was clear Bungie had well and truly gone to shit. So I wasn't going to support their shit any longer. They fucked up with the original D2 launch and first-year expansions, but clawed it back over the next few years, creating one of the best live service games out there... only to shit all the player goodwill down the crapper with LightFall.... You can't make this level of utter fucking blunder twice... players won't forgive you a second time.