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It will boil down to wanting to have a solid group, or wanting to have a group to "just get by." With a Templar DD's will be able to do their thing without worrying nearly as much about pulling aggro from the tank and eating a crit.
If you go with a Gladiator or a Assassin tank (roflwut?), their damage will not generate the threat necessary to protect the party as well as it should. This would mean more mana drain from the healer and more downtime.
This, of course, is assuming the classes are properly set up.
Even in other games, another class could tank, but that didn't necessarily mean that you wanted them to.
I'm not worried about having my job stolen by other classes. People will try, but it will not be a completely viable substitute for the real thing.
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