Blam blams hard counter nomad tactics, plus they had literally no enemies other than nomads and thus could entirely focus their tactics and strategies on anti nomad stuff. Knowing the nomad playbook goes a LONG way, a ridiculous amount of mongol victories are just a result of them pulling the same fake retreat bit over and over again while people never catch on because information spread slowly back then, once you've had ages to study all of their mind tricks they're not nearly as effective.