What is the state of the art in containerization?

Question

Virtualization

I met on the Internet that the docker (like a legal entity) is not all right. Plus, there are security problems by design, and, it seems, it is already outdated itself, and that there are already more advanced options on the market like rkt, lxd and others, that docker is alive only because of the accumulated mass of users.
Who specifically in this topic, tell me, is this all?

Answer 1

The "sphere of containerization" is not only about docker. Technologies demanded by the market always have alternatives.