Not totally pointless.
History tells us that security has a shelf life, so a label that specifies the security measures being used helps with the asset management.
However, I do think the EU needs to set up a quasi-independent organisation to do for IoT what the WiFi Alliance did for WiFi interop. It's job being to define a suite of standards-based interop profiles, a testing regime and product kitemark/labelling scheme.
Whilst a WiFi network set up to WiFi Alliance's best practises isn't as secure as a network setup based on CESG guidance, for many it did facilitate a means to move away from WEP to WPA2/AES etc. Obviously, it still needs an expert to know whether a product carrying a 2006 WiFi-Alliance kitemark is still fit for purpose in a system built using products that satisfy 2016 security concerns.