Persistent attackers have a constant stream of new tools, tactics and practices to evaluate as offensive weapons. This forces defenders to assess each as well, in an ever-escalating arms race.
This has caused an over-dependence on technology and an under-appreciation of the human nature and behavior of adversaries. The desire for waves of more data to assess is, in fact, boggling minds and breaking team and process effectiveness.
As human defenders realize this, they shift strategies to focus on fundamentals that uncover truly meaningful threats, and force multipliers that dramatically accelerate analysts threat investigation and disruption methods.