This is a case where I actually agree with the philosophy of "if it ain't broke, don't fix it."
Perhaps the logical progression would have been to make the update notifier configurable in a way that could be configured to do it the "old" way instead of changing it without an easy way to change it back and piss off everyone who likes their systems updated constantly.
And also, if something crashes, it's going to make people not report bugs because Apport tells them that their system is out running old crappy software, update to the new version, and then file a bug when something crashes. Sure, it may cut down on invalid bugs, but it also increases the chances of a bug slipping through the cracks when the perfect combination of things are done to cause it to show up.
In short; don't change the behavior, we don't like it your way. Ubuntu is the software equivalent of Burger King. Make it my (our) way.