> If you use Docker, wouldn’t you consider creating the Dockerfile as part of development?

Sure you could argue a developer could, or even should create these things in theory. The problem is then when it goes down I have made two problems out of one. Now I have to manage the infrastructure of a system and what is running on it. Realistically, and even in my current job, it's actually several systems. Now when something breaks I have to pray I can fix it. Instead of allowing a team of infrastructure professionals to at least insure the hardware is working my 8 hour day turns into 14 or 16 very quickly the second one thing goes wrong.