Early SD-WAN products provided enterprises with a way to decommission expensive, inflexible MPLS links, connect branch offices directly to the cloud and optimize WAN traffic. But many of the initial SD-WAN offerings lacked features such as integrated firewalls, application-aware routing, and advanced data analytics.
Over time, SD-WAN vendors have beefed up their products to encompass a robust set of additional features. However, many enterprises are not taking advantage of the full capabilities of the latest SD-WAN products and managed service options.
Thanks to Neal Weinberg (see source)