That would be a pep talk to increase morale, which I can totally agree with. Kind of like a paladin's aura giving a bonus to fear saves. But yelling at someone injured will not make them less injured. It might make a whiny brat who's faking an injury get up and play on. Or it might make the guy with the ankle injury play on and and end up crippled for life. In play, it lessens my character. If I'm hurt, and out of the fight, and simply yelling at me allows me to get up and fight on, I wasn't hurt too badly to fight, I'm merely a wimp, lying on my ass whining while the rest of my team is in danger. Some hero.
4E, at least to me, is very much about being cinematic. It's flashy, it's got lots of maneuvers and abilities for heroes to use, it gives characters a goodly amount of HP with which to have long exciting battles in it. One of the things I think it does fairly well is to emulate heroes taking a lot of damage over the course of an adventure, but to keep on going.
One of the tropes in cinematic adventure is the ability for heroes to find strength in the words of others. There are many scenes in which the hero is down and out, even dying, only to be brought back to consciousnesss/lucidity by the words of loved ones or allies. I recently rewatched Terminator, and near the end after their car flips, Kyle is injured and down for the count. Sarah finally orders him to his feet, and they manage to avoid getting run down by the Terminator. Kyle's wounds certainly aren't healed up, and yet he has gone from being all but unconscious to fully functional (as much as his wounds would allow, at any rate, but wounds are not part of D&D).
Now you could consider Kyle a 'wimp' for being overwhelmed by his wounds, or you can consider him as being even more a hero for overcoming the pain of his likely mortal wounds to keep on fighting, after some encouragement. How you perceive things is up to you. I prefer the latter, myself.
Now, this certainly isn't a perfect example, but I believe it to be an illustrative example of the inspiration behind the Warlord's abilities.
I'm aware that D&D doesn't model Tommy John surgery very well, lol. My point - stemming from this qoute - was that nothing in real life can be modeled by warlord yelling, either.
Then why bring up a point that has nothing to do with the system being talked about?
It's likely that a game that truly models real world injury and recovery would likely be unfun (except to a minority of players who do want that sort of thing in their games). D&D has always been rather fast paced, and even old school healing wasn't all that accurate to RL. We play to adventure, not to sit bandaged up in an inn.
I play with HP being abstract. It makes sense to me that when someone takes damage, that there is an emotional reaction to taking that damage as well and should be encapsulated in the damage total. Despair, worry, anger, fear, all of that comes into play, weakening the character overall and making them prone to possibly taking that fatal hit. So for me, a Warlord's 'healing' is perfectly valid.
Healing surges were a good core idea, and I think would have been better accepted if not for the extended rest rules. I'm currently using a house rule that if a character is dropped below 0 at some point during the adventuring day, they recover 1 less healing surge duing an extended rest. They won't get these lost surges back until they have a full day or two of actual relaxing rest (and not sleeping out in the woods or cold dungeon floor). Though going through Scales of War, it will likely be hard to judge if there's any real effect from this rule, as there's really only one or two extended rests in most of the modules.
And while I think the designers could certainly put in some wound/recovery system, I don't know if it would be as accurate or detailed enough for those who truly want it.
