Most people who think "Docker sucks" are talking about it's somewhat questionable network layer on Linux and the poor security isolation of the daemon. Non-docker alternatives like Podman don't have that characteristic.
But no one (at least no one reasonable) thinks Dockerfile's building docker images for download from docker-compatible repositories are a bad thing. That stuff runs the world. And the FreeBSD refusal to make a real attempt at interoperability is a confusing wart on what otherwise is pretty good tech.
