Jester David
Hero
Except mechanics as the basis for a class is system dedepent and is subject to change with the edition, which makes the class irrelevant. If sorcerers are only "wizards who cast spontaneously" the do you nee a sorcerer in a game like 5e that will likely have an option to replace a wizard's Vancian spellcasting with spell points? In 4e both classes were pretty much spontaneous casters and the difference became strikers versus controllers, which is equally irrelevant in 5e.Classes have always been what you do not what you are.
A wizards casts spells from memory, a sorcerer casts spells innately. A fighter, fights. Those are all descriptors of what the classes do.
In 4e at least the roles, where designed to describe what you do best in combat. You could choose a fighter, his most effective role in combat was to defend. But out of combat you could be whatever the heck you wanted. Even in combat you could stretch that definition quite a bit depending on the options you chose at each level.
Applying the yardstick of a "class is what you are" to the warlord alone is ridiculous, and disingenuous when all classes are defined by what they do.
And fighters fight this is true, but how is variable. They fight is dependent on speciality, which makes them fight with two-weapons or a polearm or a two-handed weapon.
Again, specialities are indepanant of class. Is a warrior with the two-handed weapon speciality different from a fighter? What about a Leader or Tactician speciality; is a fighter with the Tactitian speciality that different than a warlord?