Raid Question about T2 since Dungeons works best. Tank swapping??

[Huntington]

Since the Enrage method for T2 has become the near-standard way to run it, and having done it dozens of times myself, I've never seen anyone even suggest that tank swapping was a way to run it. Today in the roulette I got a WAR and PLD, which would mean that the WAR should DPS and PLD will tank, simple enough. Yet the Lalafell tank decided with the PLD that they should be tank swapping for some reason, so both would leave their Enmity boost move on then just stand next to each other and wail on it together constantly both getting hit and getting Vulnerability Up.

Was this ever a thing to do? Because I don't see how when most parties would go 1 Tank, 3 Healers, and 4 DPS. And you couldn't even Duty Finder the first five turns of Coil till 2.2.