I'm A Banana
Potassium-Rich
I could probably fairly be described as a warlord skeptic. Though I'm fond of much of 4e (still probably the most flexible e's), I was skeptical of a lot of elements, and the warlord was definitely one of 'em. Though I do think that a warlord class would be a fine addition to 5e, as well (what, I can't have layers?
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I think I'd start my analysis with what warlord fans loved about the warlord, though. One should basically never start off trying to please the haters.
And being non-magical and healing hp is something that warlord fans often cite as key to the class (and, as an aside, why the battlemaster doesn't quite do the job). Non-magical "Inspirational" healing fits the mode of what a LOT of tables represent hit points as - without necessarily having any real connection to actual physical injury or damage. They are plot armor, they are luck, they are skill, they are morale, they are not really physical.
So a warlord that was magical by default would probably be a non-starter.
You could introduce a warlord as a class or a subclass if you wanted, and folks who didn't like the inspirational healing and the narrative view of hit points they presume could just ban or not take the class, but that can be a lot of design work for little reward. Still, if psions and artificers warrant their own class, why not, right?
Another method might be to build in some explicit "morale-based HP" rules option that would more directly address the HP issue, possibly combined with a more "Inspirational Leader" subclass that captures the fictional vibe of the warlord better than the current battlemaster does. Personally, I think the Purple Dragon Knight coming down the pipe is likely to *be* that subclass, though I don't know if it'll have inspirational healing (I'd bet no, but WotC might surprise me!). Still, if it favors CHA/INT and buffs and action-granting, then the inspirational healing bit of it might be acceptable as something a campaign opts into, rather than something everyone at the table needs to accept just because Jeff wants to play a particular subclass.

I think I'd start my analysis with what warlord fans loved about the warlord, though. One should basically never start off trying to please the haters.

And being non-magical and healing hp is something that warlord fans often cite as key to the class (and, as an aside, why the battlemaster doesn't quite do the job). Non-magical "Inspirational" healing fits the mode of what a LOT of tables represent hit points as - without necessarily having any real connection to actual physical injury or damage. They are plot armor, they are luck, they are skill, they are morale, they are not really physical.
So a warlord that was magical by default would probably be a non-starter.
You could introduce a warlord as a class or a subclass if you wanted, and folks who didn't like the inspirational healing and the narrative view of hit points they presume could just ban or not take the class, but that can be a lot of design work for little reward. Still, if psions and artificers warrant their own class, why not, right?
Another method might be to build in some explicit "morale-based HP" rules option that would more directly address the HP issue, possibly combined with a more "Inspirational Leader" subclass that captures the fictional vibe of the warlord better than the current battlemaster does. Personally, I think the Purple Dragon Knight coming down the pipe is likely to *be* that subclass, though I don't know if it'll have inspirational healing (I'd bet no, but WotC might surprise me!). Still, if it favors CHA/INT and buffs and action-granting, then the inspirational healing bit of it might be acceptable as something a campaign opts into, rather than something everyone at the table needs to accept just because Jeff wants to play a particular subclass.