Really, other than brag factor not sure Torment4 is worth it. I get the same 350 Obducite at T3 that I do in T2. It’s been a while, but perhaps T1 drops the same 350 Obducite, too. In T3, I still have 2100 armor and 73% resist all; so losing another 500 or 1000 in T4 won’t matter: but why take 10 minutes to run a dungeon I can run in 5 on the lower tier, and still get the same mats?
What irks me is all my gear is 800 and maxed … so what do I get in T4 that’s better? Why do I need it? lol