Unable to coordinate and help the whole party ever... but you guys can suffer and maybe do that warlordy move by the battlemaster once in a while to one party member once in a while.Subclasses lack the mechanical heft to be more than a part-time warlord. You know, a little bit shoutey. Not really, really shoutey.
The 4E fighter had a bunch of stuff that fit the gameplay of 4E. The 5th edition fighter still came over just fine. So did the rogue, cleric, bard, paladin, wizard, sorcerer, warlock, monk, ....The problem with the warlord is that it was a popular class that fit into the gameplay of 4E, but doesn't really have a niche in 5E. Bard, Fighter, and Paladin all have sub-classes to help recreate the purpose and feel of the warlord, so the only thing really missing is the name. The full concept of the warlord is tactical combat, which isn't a base aspect of 5E, so making a class based around it doesn't make sense.
I seen a third party "Noble" who had the lazylord as one of its subtypes. Called way of the Heart or some such thing.Of course, I wouldn't call it "warlord."
Hmmm...definitely not a statement that will find universal agreement.The 4E fighter had a bunch of stuff that fit the gameplay of 4E. The 5th edition fighter still came over just fine.
Paladins were a title for the highest nobles under a king. Wizard was the title gained by magic user in 1e and there was never a profession of Wizard. Thief was a description that included anyone who stole implying no particular skill set. Class naming conventions are hmmm pretty arbitrary.these feel more like titles, not classes.
Add rules for mass combat, and bingo you got something that I think is pretty cool, and a lot more appropriate than a new class.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.