Mecheon
Sacabambaspis
Its not impossible, its just not ideal. Its being weighed down with Fighter stuff that isn't essential to the Warlord concept. The Warlord shouldn't have everything from the base Fighter chasis, and having that also limits its overall power and potential.So while you say it is impossible to make one subclass that does justice to all of those 4 concepts, which I not once proposed (remember: I said I add a fighting style as a start), I say that it is impossible to make a class that does justice to all of your warlord archetype (which true warlod fans seem to agree with because they can't agree how to do a real warlord class).
Homebrewers have done it fine, just like they have with psionics. Making a true Warlord has been done multiple times. Its just, WotC won't.