Prot paladins and feral druids often face a lot of adversity when they're raiding. The vast majority of guilds run with a warrior main tank, and that warrior main tank is always tanking the boss fights. Even the guilds that don't have a single main tank usually have a couple of prot warriors around, and the warriors are always the default choices when it's boss time.
Personally, I think this is a really bad idea, and not just because I play a prot paladin. It's true that warriors have the best all-around "grab bag" of tanking skills, but there are a number of fights where the high front-loaded threat of a paladin or the superior physical mitigation of a druid can make the fight easier on the whole raid. Making use of all your guild's tanking classes can make for smoother raids all around.
There's also player happiness to consider. Very few players are satisfied with benchwarmer status. I've known a few players with very solid off-tank roles in well-progressed guilds who got bored and left for a main tank position in a less-progressed guild. Sure, they're taking a step back progression-wise, but in the end they're having more fun, and isn't that why we play the game? Relegating some players to forever be "trash tanks" (and what a terrible name that is!) only leads to higher turnover.
Plus, it's important to remember: real life happens. If your warrior main tank is sick or on vacation, you need your other tanks to be able to step forward and fill his shoes, or you won't be raiding that night. Paladins and druids require subtly different strategies on some fights, in terms of healing assignments and dps performance. If your tanks and your raid don't have any experience working together on boss fights, you're dooming your raids to nights of frustrating wiping if real life takes your warriors away.
My guild handles boss fights, as it does most things, pretty informally. Just before boss time, all the tanks do a /roll, and the winner tanks the boss. This is one of the reasons I love my guild. All the tanks get the chance to tank, and the raid knows how to handle each fight with each different class.
There are exceptions, of course. I never bother to /roll right before Kaz'rogal, for instance. While it's true that a paladin can tank this fight, it's one of the few fights where having a paladin tanking will make things significantly more difficult, and increase your chances of wiping (dodge a few too many attacks, and--oops!--I blow up the melee.). Same for Archimonde (Why make the priests burn their fear wards on me instead of themselves?), or Kael'thas (I don't want to buy all the extra consumables I'd need to tank that!). But on any fight a paladin can reasonably tank, I have as much of a chance of doing it as any of the other tanks. And that, in my opinion, is the way it should be.
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