Are specialized switches for SDN needed?

Considering the ever-evolving landscape of software-defined networking (SDN), is there a genuine need for specialized switches tailored specifically for this technology? Do these switches offer distinct advantages over traditional networking hardware in terms of flexibility, scalability, and performance within an SDN environment? Furthermore, how do they integrate seamlessly with SDN controllers to optimize network operations and enhance overall network intelligence? Is the investment in specialized SDN switches a prudent decision for organizations looking to harness the full potential of SDN?