I finally decided to parse myself on a dummy to test my DPS using ffxiv-app and just wanted to share some results. I've parsed myself until I ran out of TP so in 4-5 min sessions.

Gear: full myth set with Bravura Zenith
Stats allocation: 30 Vit
Food: none
Rotation: SE > BB with fracture always up, IB when up, Unchained+Berserk together when up, Internal Release when up, Infuriate + IB when up

Defiance with full allagan Tank accessories: 155+ DPS
Defiance with full allagan DPS accessories: 185+ DPS
Defiance with full gryphonskin accessories penda melded with VIT and CRIT: 175+ DPS

Didn't have time yesterday to try the same out of defiance but I'm thinking I should be able to be 200 dps.
I'd say it's decent for a Tank but we obviously get crushed by a DPS classes.
For comparison, my ilvl 80 monk with garuda weapon did 275+ dps and I've only reached lvl 50 yesterday so my rotation is far from perfect.

Still, I'm happy I finally took the time to test this myself :-)