I've come across several new items that Greater ID doesn't help at all with. I'm OK with a few of them being mysteries to solve through trial and error, but not most of them. For example the new bracers seem straightforward, but they have no obvious effect on your stats (for example, bracers of precision don't increase your to-hit bonus, and there was a staff that triggered a sort of berserk rage that didn't look like it affected to hit or damage).