Quote Originally Posted by Mukuku View Post
Agree, but we know that the statement is "far more efficient". Not "slightly more", not "a little more".
We also know that their intention is for this to not matter outside of Savage and Ultimates, and they have explicitly compared the tank split to healer split, so we do have some metric by which to gauge how much this will matter. I reckon EX PF will also expect both tank types just as it does for for healers even if it's not a big deal.

Quote Originally Posted by Mukuku View Post
Assuming the devs will not fail with balance, this will mean:
  • There will be a strong incentive in bringing both MT and OT
  • There will be a strong incentive in the MT being the "main tank" holding aggro for most of the time.
The consequence of that is that "OT" tanks will find much less opportunities to "main tank" and vice-versa, which you seem to agree it's going to be by design. I find such design concerning.
Yep, it 100% is the design's intended purpose. I don't care if I'm the MT or the OT, I just want my job to be interesting and for tanks in general to be dehomogenized. This design direction opens a lot of design space that's currently unavailable because all tanks are required to function as both MT and OT. Counter attacks is one example, another would be DRK spending HP, which is the most iconic thing about DRK as a job in FF games prior to XIV and PvP DRK in XIV since revamp - it's not something you want on MT, but OT spending HP and then self-healing back in cycles would be totally fine as long as you don't do it during a buster.