It does say very clearly on top of the page that it is an "operating system", what is so unclear about it?
If you want to know more, just scroll down and read more detailed explanation
Not sure in what way some people expect to be fed the information. If you did not understand what it is from the first couple of sentences then maybe it is not for you.
They JUST changed it (probably reading the HN feedback). Now the title on tip reads "The operating system for the next generation of gamers" while just yesterday it was simply "The next generation of Linux gaming".
The change is for the better, but I would still like to have words like "Linux" and "distro/distribution/pack" be used.
If you want to know more, just scroll down and read more detailed explanation
Not sure in what way some people expect to be fed the information. If you did not understand what it is from the first couple of sentences then maybe it is not for you.