Why arent studios increasing the bitrate?

Just wanted to start a discussion around bitrate on 4k discs. Currently we are having movies with around 80-100 Mbps bitrate which Is at least 5x better than streaming services. I know the master prints have a much higher bitrate So when writing to 4k discs they are still compressing it and the quality is way better than streaming. Why don't studios increase the bitrate and maybe have the movies on 2 discs. I think 4k is the last of physical media so having a higher bitrate would be better future proofing. I know studios wont be printing 2 4k discs but its just a shower thought I had as I was checking sample video shot with cameras nowadays and they have birates around 2 gbps.