Indeed, ideally we could get docker on FreeBSD using the same approach as is used on macOS — automatically run (one or more) Linux VMs under bhyve.

I wonder if FreeBSD ought to consider a WSL2-style approach to Linux binary compatibility, too.

Keeping the Linux syscall compatibility layer up-to-date has always been a resource problem, especially when syscalls depend on large, complex Linux kernel subsystems that just don’t map cleanly to FreeBSD kernel facilities.