With the emergence of public clouds such as AWS, Microsoft Azure, and Google Cloud, networking is now being treated more like a commodity and has moved from silicon to software. This has allowed developers the ability to mutate the network to best serve the applications, rather than retrofit applications into an aging network, that is probably not optimized for modern microservice applications.
It would therefore seem nonsensical if any business would want to treat their internal data center networking any differently. However, like all new ideas, before acceptance and adoption comes fear and uncertainty, inherently co-related with the new or different ways of working.
Common arguments against using a clos Leaf-Spine architecture and SDN controllers center around one common theme, that it requires change and change is hard. We then harp back to the mythical 8th layer of the OSI model, and that is the User layer:
The network operators have to feel...