DSCv3 is compatible to v2, except with MOF files, in my understanding. You can continue to use PowerShell with it. I can only speculate, but since there is no

DSCv3 is compatible to v2, except with MOF files, in my understanding. You can continue to use PowerShell with it. I can only speculate, but since there is no more LCM, a binary was needed to properly run DSCv3 on your machine.