In my experience, very, but it's also not magic. Being able to package an application with its environment and ship it to any machine that can run Docker is great but it doesn't solve the fact that modern deployment architecture can become extremely complicated, and Docker adds another component that needs configuration and debugging to an already complicated stack.

[–] skuzz@discuss.tchncs.de 1 points 3 weeks ago

And a new set of dependency problems depending on the base image. And then fighting layers both to optimize size, and with some image hubs, "why won't it upload that one file change? It's a different file now! The hashes can't possibly be the same!" And having to find hackey ways to slap it so the correct files are in the correct places.

Then manipulating multi-arch manifests to work reliably for other devs in a cross-processor environment so they don't have to know how the sausage works...