For many developers, viewing the memory results in a higher-level view, where 
e.g. all collections data would be grouped into a single line, would make some 
memory profiling usecases much easier.

The idea is something like this:

Collection                  Size        Instances
+ HashMap                   120k        10
+ Array of java.lang.String 100k        3
+ LinkedList                 30k        5
+ ArrayList                  20k        3
  + ArrayList 1              10k        20
  + ArrayList 2               5k        10
  + ArrayList 3               3k        6
    + xxxx
    + yyyy
  + ArrayList 4               1k        2
  + ArrayList 5               1k        2

With generics, the collections of different types could be separate of grouped 
together.