> [..] majority of readers or Docker users have never ever heard of FreeBSD Jails [..]

I would argue that said users have never heard of UNSHARE(1) either, although Linux pretty much wipes the floor with anything else when it comes to containers. You can use UNSHARE(1) to create your container, extract a base image of your preferred distribution, configure it and start an instance. Heck, you can even create and package a shell script that does all the above for you. Nobody does that on Linux even though UNSHARE(1) (and friends) are very much finished products. They are not the products people want, that is, application specific containerization solutions like Docker, or something that can be easily deployed at scale in a reproducible and compliant way.