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by debdrup 3223 days ago
My guess would be that it's because jails are exclusive to FreeBSD, and not that many people (compared to Linux, that is) run FreeBSD. Jails were also devised as a tool for the sysadmins toolbox, whereas docker is a tool for developers toolbox - and each has its own strengths and weaknesses.

Finally, jails do lack a bit of the functionality that lets docker do some things - but that isn't something that can't exist, an in fact there are certain signs that such instrumentation might be in the process of being written: https://twitter.com/FiLiS/status/894651614002393088.