Blame The Force Unleashed for that. It was originally meant to be a big multi-media project set in the dark times, but the game's development issues and ultimate mediocrity doomed it.
You did miss one big EU thing in TDT, the Dawn of Defiance adventure path for Saga Edition. A middle part has been set to 17BBY, and the whole thing has time skips of (intentionally) unclear length so it may go even deeper into The Dark Times.