Manbearcat
Legend
The question isn't "does it already do this," but rather, "do these things need to be a different class, or are they part of what a fighter could do?"
IE: Where, mechanically, should the home for these abilities lie? Are they things that are not part of the ability set of a fantasy warrior, and thus need a new class, or are they things that are within the ability set of a fantasy warrior, and thus belong in the Fighter class.
I would agree with you if this wasn't an edition of Dungeons and Dragons with an established class legacy (for the Fighter) of which the designers have made it clear and present that they have anchored their vision to. Hence "does it already do this?" Otherwise, we would be able to easily stake out the same logical territory for any class outside of "Fighting Man", "Supernatural Guy", "Guile, Wits, Tools and Subterfuge Guy." Ranger, Paladin, and Barbarian would easily be folded into the "Fighting Man" when you aren't interested in the legacy-laden question of "does it already to this?" Give me "do these things need to be a different class, or are they part of what a fighter could do?" and we've changed the landscape of the designers' vision.
And thus becomes the crux of the matter. To many 4e fans, the Warlord class is its legacy and not just because of the class but because of the genre implications that come with it. The willingness to dilute its mechanics, its focused thematic content and (as important) its genre implications, while simultaneously maintaining the legacy territory of the Ranger, Paladin and Barbarian is a pretty clear message to 4e fans that the designers are not anchored to (interested in deferring to?) that legacy.