I only tried it once, and the technology was pretty flaky at the time. I don't think it really went anywhere.
The focus was on the fact that you could have multiple people editing a single codebase at once, rather than on doing it in production. Indeed, you wouldn't have to do it in production, you could work on a shared development image. That was definitely a very interesting sensation, having a whole team working in a single space; like pairing but much more so. Lots of calling out to other programmers to ask them what they thought, or to suggest something. You could all work on parts of an idea at once, so you could try things out quickly. But there was so much overhead in making sure you didn't tread on each others' toes.
This doesn't seem to be the emphasis in Dark at all. In fact, i don't know what Dark's story about collaboration is. It seems to be much more about the instant deployment, and all sorts of sci-fi tooling to make that safe.
Seriously, if you quint, it sounds like "cPanel + integrated PHP editor for cloud era".