Is it actually worth it if you have decent gear? I mean it's clear that it's going to be invaluable for new tanks to reach 540... but after that point...
You can see my Tank set in my signature below.
As you can see, I'm at 540 defense, but in order to do so, I pretty much have to put +Def gem everwyhere.
So to me, getting the new Gargoyle Rune that gives +25 DEF rating and 3% more Sta, means that I can socket gems with more Stamina, Hit, Expertise, Parry, etc... maybe go for socket bonus? I'll actually be able to socket a meta gem since I'll meet the requirements. I could even get rid of my seal of the pantheon and use that 111STA trinket instead. The 3% more Sta compounded with all those news gems mean I'll be looking at a lot more hp overall.
The problem is, that I lose 4% parry by dropping swordshattering - that's a lot of mitigation (And you need a **** load of +parry to amount to 4%!). Not only that, but ultimately as my gear get better... my Defense will keep rising anyway. I'm only a few emblem short of buying a ring with 54 Defense (which is a +29 def over my blue ring) and as I replace my Heroes T7 with Valorous T7, my defense will also only keep going up. Add in the new Sigil which is supposed to give 50 something defense rating from what I understand, is meant to 'be up' all the time. All this means I'll be able to resockets those yellow gems anyway.
In short, I kinda feel like I'm only a handful of drop away from not even needing it. Once you're Defense 'capped', the +25 Defense Rating isn't that hot (Since +25 DEF isn't that much mitigation anyway)... and while the hp is nice, it seems to me mitigation is better.