What are the disadvantages of SDN?

Could you please elaborate on the potential drawbacks of using Software-Defined Networking (SDN)? Are there any concerns regarding security, scalability, or compatibility issues that organizations should be aware of when implementing SDN solutions? Additionally, how does the complexity of managing SDN networks compare to traditional network architectures, and could this lead to additional costs or challenges for IT departments? Lastly, are there any specific use cases where SDN may not be the most suitable option?