In my opinion there is a difference between installation and use. Yes, Ubuntu is simple to install and yes, once installed it's easy in use, but... If you encounter problems during installation it's not exactly easier to solve them as with say, Fedora. While installing the versions are rather similar, ok, there is a root but is that the reason to call it inermediate? And once installed, Fedora has a rather good community support called fedoraforums...
The same goes with Centos, by the way. And I also installed Debian and had to download a network driver om another computer and I put it on a usb stick in order to get the system to work, but afterwards, no real difficulties: it's just as easy to install a program as say in Fedora or Debian or the debian derivate Ubuntu. So in my opinion there are only two categories: the more primitive installers like what you label advanced where a user has to make a choise, or the rest where the biggest challenge is to put a CD / DVD / USB stick in the computer and reboot. By the way, in an Ubuntu installation one also has the choise where to install. Putting a disk in a computer to install a new OS is never exactly a beginner task.
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