That one-liner won't work (for me), it's missing a slash in the awk command. I have this aliased as `docker-rmi-junk` since it's so common.

    docker rmi -f $(docker images | grep "^<none>" | awk "{print \$3}")

I agree with everything else you're saying completely. Although messaging a value prop is hard when you have so many use cases. We faced the same issue and ended up trying to segment users as quickly and high up in the funnel as possible so we could speak directly to their needs.