Sure docker is not perfect but isn't running docker containers mainstream practice now? I think your response is a bit of exaggeration.
Definitely not.
Docker is a lovely developer tool, but it’s not, in my experience, ever been (even with swarm when that was a thing) suitable for production workloads.
Containers: yes.
Docker: that’s a container runtime, and definitely not mainstream for production workloads.
No one is seriously confused about "using docker" meaning, oh hey, I run my containers on kubernetes. I have literally never met someone who was confused about this. I suppose some people just stop at "I use docker" and don't know what that means when it hits production... but I'm skeptical they actually think a copy of docker is running out there in prod.
...but to be fair, the parent comment did say that running "docker containers" was mainstream; and fair enough.
My point was running containers using docker most certainly is not.
So containers are most certainly run in prod using docker (to be specific docker daemon), are they not?
Care to explain what makes that docker tool/runtime unsuitable for production ?
Docker runs as the Container Runtime under most Kubernetes clusters (in fact every Kubernetes cluster I've seen). The only other CRIs that are commonly used are CRI-O and ContainerD (which Docker already uses), and last I saw CRI-O was < 10% of the Container runtime market.