It's the lost actions. I poked my head in yesterday and there were no more than 10 people in the zone. People came and went. Someone entered the party and suddenly bosses were melting. If it's not lost assassination, it's something else. I never got into that, as I was never getting that deep into the jobs that can do that.
We don't need more gear and I'm sure the team was happy not to have to make more niche gear. We already have our standard sets. This is basically side content, so the rewards aren't going to offer an alternate path to something like savage tier gear.
Entry for criterion is 610. That's crafted gear. All you need is experience with mechanics and processing them.