It seems like you're missing a lot of things.

As a developer, how do I run FreeBSD Jails on my MacBook during development? With Docker for Mac, it is trivial for me to do everything on my Mac, and the fact that there is a virtual machine is completely invisible to me. Everything "Just Works". With FreeBSD Jails, I would have to actually interact with a VM constantly, including the pain of shipping files back and forth.

As a developer, are popular databases and applications pre-packaged as FreeBSD Jails so that I can spin one up on my laptop with a single command? Where is the Docker Hub equivalent?

As a developer, how do I orchestrate a collection of FreeBSD Jails for each project? With Docker, I define a single `docker-compose.yml` file for each project. With a single `docker-compose up`, the entire project is running including dependencies such as databases and other related projects in a completely reproducible fashion. This makes it trivial for coworkers to spin up a project on their machine and immediately be productive without spending an hour trying to get all the right versions of everything installed and up and running.

As someone responsible for deploying an application to production, what is the story around FreeBSD Jails for deploying across a cluster? Is there a Kubernetes-equivalent that can manage the allocation of resources, blue-green deployments, and manage the lifecycle of my FreeBSD Jails?

As someone responsible for deploying an application to production, do any of the major clouds support FreeBSD Jails? With Docker images, I can deploy those straight to ECS Fargate, Google Cloud Run, and half a dozen other services. Then I don't even have to think about my own infrastructure unless I need some really specialized hardware for a specific application.

> the rest barely matters anymore.

Everything else matters so much.

As to your earlier point about ZFS, most Linux distros these days seem to trivially support ZFS. Even TrueNAS is working on switching to Linux with their TrueNAS Scale offering.

It's not that I'm opposed to FreeBSD... FreeBSD is just a hard sell. It's hard to pin down exactly what you're gaining by throwing out all the collective Linux knowledge of an organization and switching to FreeBSD. FreeBSD is an N-th tier platform for pretty much every programming language except C, so good luck when you run into random subtle problems. Also, good luck doing hardware accelerated machine learning inference or training on FreeBSD... it's probably possible?

> the single important binary

This is also such a weird thing to throw out there. I like a good Go program myself, but most companies are not only deploying single-binary statically linked applications. Most companies are also deploying some kind of Ruby, Python, or Java application... none of which are likely to be a single file in practice. Most of them will have a variety of shared libraries, and I don't know if I've ever seen a Ruby application shipped in a `FROM scratch` container before. Technically possible, but that's just not common reality as far as I've seen. It sounds like you're proposing that everyone is already running in `FROM scratch` containers, so a FreeBSD Jail is just a drop-in replacement.

Linux containers are far from perfect, but as a developer... I have played with FreeBSD Jails before, and come away frustrated by all the work you have to do yourself.