Actually, @
Enitzu, you're right AND that's exactly what we've done - that's why it's so much better than any tool tanks have had in the past. Just like DPS sims model every DPS ability and rotations... we modeled every tank ability and tank rotations. We modeled every ursoc ability that does damage to you, and it's very true to the actual fight. So yep, we did what you said, that's why it's actually a very useful too
You can run some simulations and take a look at what it's doing, hit me up if you have some questions.
As for leech, it's correct. Leech is a good stat for tanks, so if you have gear with it, it's very useful. For example, if you're doing 150k dps and 10% leech (which you can get with having leach on 5 pieces of gear, which is a lot, but doable). So that would do 15,000 healing per second. That's as good as a low level HoT from a healer. So that's pretty good
So when evaluating 2 items, one has leech and maybe an 'ok' secondary stat, and the other has the best secondary stat and no leech - you'll want to compare those items knowing how good leech really is. Maybe the item with leech is better, maybe not