Your point about Jails vs Containers (popularized by Docker) is a naive rose-tinted glasses view. Jails is aimed at security and stops at that. To create something like docker-compose or Kubernetes with Jails is nigh impossible.

This "complete software stack" deliverables is what makes the difference today. You deliver software with greater ease. Jails isn't meant for that. Ignoring this point and claiming the same existed for 15 years is wrong.