Docker solves the problem of breaking what you have because you can't. The isolation is built-in. Everything is contained. Of course if you're editing files lo

Docker solves the problem of breaking what you have because you can't. The isolation is built-in. Everything is contained. Of course if you're editing files locally or fixing a Dockerfile it's all the same, but it's not the commonality that's in discussion here. And what's all this about understanding? Who said we don't understand the software? That's your assumption but complete untrue. Managing everything directly isn't a sign of deep understanding, it's simply your preference, one that I and many others don't share. Abstractions exist for a reason. While this particular article might be over-leveraged for their scenario, it says absolutely nothing about the quality and need of those abstractions elsewhere.