But Docker is the problem, because all that Docker isolates you from is the self-made problem of mixed library situations on host systems, at the expense of loo

But Docker is the problem, because all that Docker isolates you from is the self-made problem of mixed library situations on host systems, at the expense of loosing an easy ugrade path for said libs, running the Docker daemon as root, and loosing the host authentication context. A very bad trade-off.