I agree that the majority of parties do just fine with 1 tank but that's because with everyone i90+ you can just burn everything and heal through any extra damage. The problem is that you have to consider that you could potentially end up with a full party of people in AF gear in which case you are going to need a second tank just to pick up adds. I realize it is an extremely unlikely scenario but it is possible. That being said it would be great if there was an option for more customization in duty finder such as solo tank. They could add an ilvl restriction or something to ensure that you are not setting people up for failure. Duty roulette on the other hand probably has to stay the way it is because its there to provide newer players with assistance on dungeons that end gamers would otherwise never run.