in my opinion 10 bit raw is EXACTLY all an indie/budget filmmaker would need in terms of color depth... the exact sweet spot... it's adequate for working in rec.2020 color space and provides great color-grading flexiblity... on the other hand it still keeps the file size smaller and the workflow simpler while having unique features of raw like applying gamma curves and better exposure tinkering in post... and it is way easier for sd cards to handle the data...
i think 12 bit raw is something feasible only for pro studios and 10bit workflow is becoming more of a future standard for tight budget filmmaking (thanks to 10 bit monitors becoming more affordable and standard everyday)
actually as a bmpcc shooter i rarely needed anything other than 10 bit proress422 hq but sometimes i wished to have the 10bit video while having some of the raw capabalities and flexiblities... so the 10bit raw is the the ultimate solution...