Earlier quoted context omitted.
The article actually addresses that - why would Google (or Samsung or anyone really) risk device issues by doing this kind of upgrade? What is there to gain on a running device except angry users due to breakages of already working functionality? There's an upwards trend of people DISABLING updates because they tend to break tools they use in daily lives.
>What is there to gain on a running device except angry users due to breakages of already working functionality? That's true, but regular distros are also faced with the same dilemma, and you see both cases. RH will patch a kernel to death ship of Theseus style for a decade, whereas Canonical offers newer stable kernel releases (although they also maintain the original kernel that the distro shipped with). Canonical…
Things like bluetooth, OpenGL drivers and Wifi drivers are usually the pain points which love to break (or more accurately: break in a different way) when upgrading them. This causes those endless "I've updated my iPhone/Android phone and now it doesn't work with my car anymore!" posts. It's usually preferrable to keep the things working as they are, since we humans accept that more easily.