How do we feel about tank damage right now?

[Shurrikhan]

Last time I checked FFlogs to see DRK's DPS on E1S, it varied from 6k to 9k depending on percentile. That's 50% more, do we really need a larger scale to differentiate tank skill ?

To be fair, that has a whole lot more to do with tanks who don't believe they need to optimize their dps and can be carried despite that because the rDPS advantage of optimization (or disadvantage of poor play) is so small, than it has to do with tanks already being difficult. Simply put, a DPS dealing only two-thirds of what they could... doesn't get to stay for very long unless the other dps are wholly willing to eat up that added burden, which, make no mistake, is quite a bit larger than the burden inflicted by poor tank play.

Rathalos EX, where the optimal pug strategy was 3 tanks and a healer.

If you could tank/healer Titan EX, the fight might take 18 minutes, but you're also far less likely to wipe at any point, meaning at the very worst case you lost 6 minutes, but saved, oh, who knows.

10 minutes to 8 hours, give or take.

I'd actually be totally fine with that if the added risk of taking DPS wasn't due to RNG, poor telegraphs, or the like. Just as I'd like to see scenarios by which taking a single tank could be viable, I'd like to see the occasional excess-tanks composition as a cheese strat so long as it comes at cost and does not therefore become dominant. Using tanks to absorb unmitigateable risk sucks, because it just comes down to statistical risk management. Using them to make manageable an fight that would otherwise be too difficult at a party's current skill level (where below the balance point), though? I've got no issues with that. It just makes me wish further that tanks could have broader impact (like, more skills being interceptable, etc.), so that there was more interaction involved in those varying comps.

That's why, in my opinion, they should have separated tanks between OT and MT. Basically, every tank would have the mitigation skills from role actions, but "MT" tanks would have more personal mitigation skills and "OT", more transferable/raidwide mitigation skill. So, this way, even without a tank swap, the OT could have specific responsibilities.
After all, DPS are already separated into three sub-categories, why not tanks ? Or even healers...

You don't need to bar all designs from ever using a single-tank setup, or else bar half of all tanks from said single-tank setups, just to make OT mechanics. We've already seen plenty of them in more interesting fashion than we see now. You can have more than just "Both tanks always take damage simultaneously" or "Ha, your first tank is effectively no longer tank for the next minute! Better hope you've got another!" as a means of encouraging the use of an OT.