Even considering all buffs, Cunning and % Physical Damage, Skeletal Knight still has a higher damage than Iron Maiden. For end game builds, Skeletal Knight has too low health and can be easily killed, so we hardly know it has such a high damage. But for beginners, it is too dangerous.
In Chinese community, there have been many new players recently. Many of them have complained about this issue. They can’t understand why they died in just one hit despite having full health.