In the original, many abilities were weak, including the war cry, storm, and titan's lightning.
The damage from the war cry should be many times higher than the damage from a regular attack because it's performed from a distance. Only then will people fear it.
The example isn't convincing. For example, 1 sorceress can also apply a slow effect to 1000 red dragons, and with a guarantee, so what? Is that overpowered?
The damage from the war cry needs to be increased anyway (maybe I can do that). But it's still an AoE, so it's better not to increase it too much ;)
The sorceress will slow them down, and they'll be red, while the knight will kill 500, and they'll be black ;)
Although, I'm all for this ability.