I'm a heavy docker (ab)user, but I haven't gone through the source code - i.e. perhaps there is some complexity I'm overlooking. But couldn't Docker provide ad

I'm a heavy docker (ab)user, but I haven't gone through the source code - i.e. perhaps there is some complexity I'm overlooking. But couldn't Docker provide additional file handles for extra logging streams? Programs which understand they live in a Docker world could hook into an special system call directly. Non-Docker-Logging-Enabled apps could have a helper program (conceptually similar to 'ip netns exec') remap STDOUT & STDERR.