There are disadvantages to constant, automatic updates.
I had a call from someone who'd been using Chrome to regularly print a web page, and one day it just stopped working. The site hadn't changed, but for whatever reason the latest version of Chrome just didn't render it. And of course trying to install an older version of Chrome was quite difficult.
(In Google's case they do now have a way to disable the updates, but not all software is so good about it)