ARRI Log Not Suitable For Grading?

Team 2 Films uploaded a color management master class to YouTube a few months back, and in their zeal to promote an ACES or RCM/DWG workflow, they say that ARRI Log C was designed solely for camera capture, not for grading, which might have been true of ARRI’s old Log C, but is not true at all for AWG4. According to ARRI, “The new color space AWG4 was designed in cooperation with colorists for better grading results. Therefore it is the first camera color space which not only stores the captured colors of the camera efficiently, but also is designed for best grading results.” AWG4 also happens to be larger than BT2020. The Alexa 35 and REVEAL color science were introduced 1-1/2 years ago, so it would have been nice if they’d at least have mentioned that in their tutorial. Not only that, but BT2020 is not a delivery format, it was intended as a container. Commercial material is not mastered in BT2020.