My optimism comes out of actually using Docker, knowing the inner details of the source, being aware of what it can do (as opposed to what the hype claims: "alternative to VMs").
If you want to use it, go ahead. If you don't, then don't.
If you want help, I'll help if I can.
But I don't want to waste my time defending Docker or providing any counterpoints to any arguments.
That blog post has its moments of truth.
But then it adds mountain of FUD around everything. By the end of it, I felt like I'm being trolled!
"Docker is the devil and will eat your kittens and shit in your bed."
Docker is a tool... like a hammer.
Like that hammer, I can put it to good use, or bludgeon my thumb and then complain how the hammer was just bad for humanity.