iirc, they nerfed trash xp awhile back and also removed the chain bonus in dungeons, and buffed the boss amount. This is just another step on top of that. Can't wait for the next step to be removing per-mob gil/mat drops on the older dungeons that did that.
There's only a couple specific fights I'd rather people hold to LB3 for, and if it's not for quickly killing an Aetherial Tear, then it's likely for "playerbase bad, healer lb3 backup" reasons.
There have been so many god-awful tanks returning to the game that it's a gamble if they don't go splat pulling wall-to-wall. Absolute night-and-day difference running experts with my static than DF with regards to my dps upkeep as healer. It's not like it's an iLvl issue at this point when all I get is the msq expert dungeon which caps is low. Just tanks who simply don't rotate their CDs of which they have 3-4 per pull to use.