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I think its mostly related to cost, Perhaps the greatest selling point for SD-WAN is the ability to cost-effectively mix and match network links according to content type or priority. Both internet broadband and cellular connections are less expensive than MPLS, so customers can choose those links instead of the expensive MPLS network for certain types of ...

Are physical routers, who have different management interfaces (SNMP, NETCONF, and so on), able to speak to an SD-WAN controller? No, not generally. The router needs to provide access to its forwarding plane, e.g. using OpenFlow (which the controller needs to support as well). You cannot use configuration protocols like SNMP or NETCONF.