At least on Debian, it plays perfectly well with the Distro's package management. They use it to auto update google-chrome in preference to their roll their own on effort Windows. The same update system works perfect well on all Debian derived distro's. I'm not familiar with an rpm based distro to say for sure, but I imagine the situation is the same. So "fragmented" means supporting 2 very well tested distribution systems rather than rolling their own - and having the "take out all Macbooks" problems they did on OSX.