Tanks are fine (show your support so they don't change them)

[Kinkoz]

If they gave more abilities and controls to the titan Egi allowing the SMN to have more agro skills with it, then I would say yes it would qualify as a tank.

But, see, you had to tack on an additional qualifier to make your case, which means that, as the Job currently stands, Summoner is not a Tank. Nor would it likely be made such even with additions to the abilities of Titan-Egi, but that's just my speculation based on the functions of its other combat pets.

I mean, Monk has a defensive stance and CAN certainly tank for a short time in a party under very extreme circumstances, but that doesn't necessarily qualify it to fill a dedicated Tank role in a party. Not with the way roles currently work in game.

If they took away PLDs ability to move at all during combat, removed all but savage blade, flash, and invincible, but instead gave u a pet that did DPS levels of damage, would you be invited to groups as a tank or a DPS?
My answer depends on your answer.

You're throwing out an awfully abstract and unlikely example there, but Paladin would probably be made a DPS instead of a Tank if that were the case.

Again, I feel like you're both overlooking the fact that this game adheres strictly to the Trinity, but it's not my intent to argue the necessity, benefits, and detriments of that role Trinity structuring. That can be saved for another discussion entirely as I have no vested interest in that particular matter.