Question: what are some of the weaknesses of sd-wan?
Answer: SD-WANs have not been fully adopted yet. ... 
There is no on-site security functionality. ... 
IT staffs will have to be heavily relied on in order to deploy and maintain this technical solution. ... 
SD-WAN networks are immune to slow performance.
There is no true end of end QoS if using just SD-WAN provisions only.