Just because you've never seen one or had to deal with one directly does not mean you're not dependent on one.
I think the discussion was about running your own SAN, i.e. creating your own EBS.
As it happens EBS itself is not backed by a SAN either. According to the rumors it's implemented using either DRBD or GNBD.
Just because you've never seen one or had to deal with one directly does not mean you're not dependent on one.