Even without Kubernetes this kinda was indicative of the FreeBSD community missing the point, jails are neat but docker added a lot of ease of use above the how you basically managed jails manually (at least according to official instructions), people just kept mentioning that the capability had been there but missed that the ease of use was what charmed developers.

Also hurting it was that the Docker story on FreeBSD is had attempts to make it "native", through the Linux emulation layer with ZFS native functionality to handle the VFS parts and while that could have been elegant it required cutting edge and afaik never got really production ready (There's apparently docker port now via VirtualBox).