Here is the basic idea re: catering to morons. Experienced users can and
will change it to suit themselves. They allow users to do that. You can add
PPAs to your sources list and change as much as you like. Things do not
work as well in reverse. Newbies cannot tailor it and a dumbed down system
works for them. The model is not so luch OS/X or W7 or 8 as Android. They
want a simple interface that does not get in the way. android works
because nobody knows it is Linux. Marketingwise.