Tequila Sunrise
Adventurer
Yeah, D&D has never needed any clear and present reason for another class. Nobody needs the knight-in-shining-armor-with-god-magic class, or the tribal-warrior-with-anger-management-issues class, or the jack-of-all-trades-I-sing-you-good class, or any of a dozen others. (And some of them are real head-scratchers. I mean, spell-thief, really?!)You never "need" a class but we have sorcerers who have all there stuff stolen by wizards. Not LG paladins who sound a lot like clerics (though 5e & 4e differentiate them well). Warlocks who are a mish mash of trying to be different design & lots of terrible options.
So no enterprising game designer, pro or amateur, who wants a warlord class need humor this question.