I personally don't prefer CUDA (or any other form of lock-down), however they started CUDA integration ~5 years ago (or even before that), so they need to start

I personally don't prefer CUDA (or any other form of lock-down), however they started CUDA integration ~5 years ago (or even before that), so they need to start another migration effort to support another technologies. While I use Eigen extensively on CPU, I don't follow any mailing lists of them, so I don't know the internal state and mindset.