Nice to see an expert get it right. Not always the case. When the BMPCC4K was first introduced, some folks liked their results shooting at the low end of the ISO 3200 range. I tried that too, but generally decided to shoot ISO 400 or 3200 to maximum the respective dynamic range.
I’ve also been surprised how well the BRAW image can be worked in post when it’s sitting in, for example the lower half of the camera histogram. So it doesn’t need to look like an ideal or ETTR image to get good results in your deliverables.