In the Before Times, that is before MMORPGS, a Fighter type was described as a tank or a brick. The tank, or brick, was typically a tough fighter/brawler who could dish out a lot of punishment and in return take a lot of punishment in return. But there wasn't an expectation that the Fighter would get punched in the face while everyone else in the party remained safe from attack. Sure, my Fighter would certainly try to protect the Magic-User, but he wouldn't be expected to maintain aggro or something like that.