Having an additional layer of restriction (be it an alloation and workload scheduler or whatever) is additional security. The fact that there are vulnerabilities that bypass layers of security is irrelevant. The power button on the machine is a vulnerability to your software. The fact the restrictions are possible with other tools is irrelevant. Grouping functionality into a singular paradigm has utility.

To be fair, more security by additional tooling adds a vulnerability in human error, but that's true of all the tools.