Take, for example, this post from CoreOS back in March 2016 that suggested that they might know a way to improve systemd-journald performance: https://coreos.com/blog/eliminating-journald-delays-part-1.h...
It smelled suspicious, but its release generated a bunch of noise on HN anyway. And they never followed up with subsequent parts, which suggests to me that they never found a solution in the first place.
I'm not suggesting that GitHub is blowing smoke -- if you truly have a solution, that's great! But there's no harm in gathering documentation and source code and cleaning it up and waiting until it's good and ready to go. Otherwise, I frankly mistrust the motives and abilities of those involved. Call me cynical if you must.
To paraphrase from another industry, "sell no wine before its time." There's a lot of wisdom there that is equally applicable to products in our industry too.