So, full disclosure, I helped create and ran the developer tools group at a large, well-known tech company. This is a space I'm intimately familiar with.
The idea seems pretty straightforward to me and not particularly insightful. Calling it an OS is different from calling it a platform, but effectively it's the same thing. Perhaps more interesting are the implications of that analogy -- do you ship APIs and have a lot of third party people building on top of you like in the Github model or do you go more in the direction of Atlassian? I know that's a bit of a false dichotomy, Atlassian has APIs and Github is clearly trying to extend their toolchain, but in general you have one with a rich ecosystem and the other where you mostly ship what they provide.
For myself, I see GitLab trying to be more of a Github alternative than an Atlassian alternative. I don't know if that's your strategic intent, but that's how it comes across to me. In either case, I think the industry in this space is pretty unexciting in terms of the kinds of innovation that are happening right now. Google still has a toolchain that is a decade ahead of most of us, and I don't see anyone really tackling that head on.
In my view everyone has open APIs and the difference is:
1. GitHub focusses on a marketplace ecosystem (although I hear they will be adding CI soon)
2. Atlassian has a suite of applications that work well together and you can buy as a bundle
3. GitLab is a single application for the whole DevOps lifecycle, one codebase with everything from planning to monitoring, one UI, reliable upgrades, everyone on the same page
You could try on Linux for size, but I don't think it fits.
So either as an analogy it doesn't work, or this idea doesn't scale. :) BeOS is the only OS I've used that I both liked and that had a single design vision behind it. I think that this is most likely an artifact of it not being successful, though. If it had been widely adopted, it would have gone the way of MacOS or Windows.
The idea seems pretty straightforward to me and not particularly insightful. Calling it an OS is different from calling it a platform, but effectively it's the same thing. Perhaps more interesting are the implications of that analogy -- do you ship APIs and have a lot of third party people building on top of you like in the Github model or do you go more in the direction of Atlassian? I know that's a bit of a false dichotomy, Atlassian has APIs and Github is clearly trying to extend their toolchain, but in general you have one with a rich ecosystem and the other where you mostly ship what they provide.
For myself, I see GitLab trying to be more of a Github alternative than an Atlassian alternative. I don't know if that's your strategic intent, but that's how it comes across to me. In either case, I think the industry in this space is pretty unexciting in terms of the kinds of innovation that are happening right now. Google still has a toolchain that is a decade ahead of most of us, and I don't see anyone really tackling that head on.