In fact, (2) is not as true as it used to be. This graph, http://cdn.arstechnica.net/wp-content/uploads/2014/07/chrome..., shows that about 6-7 percent of worldwide browsers are out-of-date Chrome installs, and the trend is for that to grow.
From http://arstechnica.com/information-technology/2014/07/window...
1) There have been so many versions and not easy to know what came when.
2) Most people get updated to Chrome latest automatically without any fuss.