I'll argue that DNA Center, or more specifically DNACs software defined access, hasn't revolutionized campus security, because it in itself didn't really introduce anything new. Prior to DNAC coming around, we had already had 802.1x/MAB authentication and TrustSec with ISE, and VRFs were also well used. These technologies are mature, reliable, and easily deployable without DNAC.
DNACs more recent plays which Jedolphi touched on, Endpoint Analytics, and Group Base Policy Analytics, have also been around for a couple years if you look at Cisco's network agnostic competitors. A couple examples could be the like of companies such as Ordr or Zingbox (there are many others too), who have been in the market for much longer, and have superior more complete products. Cisco has only just begun executing on the vision for these tools, and to be frank they are years late to their own game.
For me, DNAC's true goal is the promise of simplified network device onboarding and configuration. This is something that I feel is still yet to be delivered because I don't see people preaching the ease of deploying, integrating, or troubleshooting SDA networks.
So does it bring anything new to network security? No, not really, it just tries to create a convenient solution wrapper for the existing security components.
