I would have to see their statblocks to judge. If they're in 5.24, I'm likely to not be able to see it. But it's quite likely that the warlord, being a legendary creature, is scary enough to get a pass on being able to cause fear.
And the nice thing about 5.14 is that it's so vague at times that you can reskin things like a battlemaster's Goad into being at least semi-mystical.
I'll also point out that, unless 5.24 changed things quite a bit, the frightened condition doesn't cause someone to lose multiple actions, and only on rare occasions does it cause targets to run away. The frightened creature simply has disad on some rolls and can't go closer to whatever it is that frightened them. And most of the time--maybe even all of the time--the frightened condition only lasts until the end of the next turn or allows for a save at the end of each turn.
None of which addresses the core point.
The claim was that a game which forces a character into a particular emotional state (fear was the topic at hand, but the claim was made in a way that was more general)
specifically because they failed a roll, is a game that cannot feature agency, because it is a rule dictating what a character feels. This is of course immediately undercut by a massive glaring exception--magic--but I am well aware that
that ship has sailed, and am willing to accept the modified claim that a
mundane situation would be unacceptable intrusion into player agency as had been defined, e.g., the player has absolute control over the thoughts, feelings, and actions of their character outside of non-mundane causes, or more succinctly, "The rules cannot tell me what my character
thinks."
I then cited
several examples where D&D does in fact do that exact thing: a purely mundane source, written as purely mundane, which can in fact force a specific mental state (fear), specifically by having the player fail a roll.
You are now, as I said and which you have ignored, creating one
ad hoc exemption after another, up to and including the DM
blatantly ignoring the explicit descriptions in order to
make mundane things non-mundane, in order to shield the original claim from criticism. This is well past any form of reasonable defense--you are inventing new justifications as each example comes up, hence, making the original strong claim riddled with holes.
D&D absolutely does (a) have purely mundane creatures/persons, who (b) can induce a specific mental state in a character against the will of that character's player, as a result of (c) the character failing a roll to avoid that mental state.
The original claim was that doing such a thing is a gross violation of the kind of agency D&D allegedly promotes, and which BW and other games allegedly strip away. I have since shown that such a gross violation is in fact something D&D has done since
at least 3rd edition, with a dragon's explicitly non-magical
frightful presence, and which the current edition has continued.
You have tried to assert that the original claim is perfectly fine because:
(a) Large predators should be able to force characters to feel fear against their players' wills
(b) Mundane beings who happen to be classified within the rules as "Legendary" can be parsed as supernatural
(c) The DM is at liberty to rewrite things so that, even though the character in question is
explicitly not supernatural, the DM may present them as such (in other words, straight-up Stormwind Fallacy, "X cannot be a problem with Y because the DM can change X to not be a problem")
(d) The "Frightened" condition doesn't
necessarily take away a character's actions, and thus somehow does not count as an induced mental state
These exceptions poke massive holes in the original claim. In order to integrate them, the claim has to be rewritten as, "The player has absolute control over the mental state of their character, outside of explicitly supernatural causes, unless they're faced with a massive predator, or a creature which is not supernatural but the DM has rewritten to be supernatural, and even if such an effect occurs from a mundane source, the mechanical effect of certain mental states is so small it should be discounted as not really a mental state at all." Surely you can see how excusing these exceptions has
radically weakened the original claim, to the point that it hardly seems to have any weight left at all.