Great news about the kernel! I take it you're purposefully ignoring the improvements to the tooling (docker machine, docker for mac, docker on windows), the ecosystem (docker hub, docker security stuff), the Docker format itself, docker-compose, etc etc etc.
None of this matters? It's just the "user land running away with hype and credit", right? Not because all those actually solved an issue for developers, rather than being a random kernel subsystem that you could use if you knew the arcane incantations to summon it, and that only worked on Linux.