package Stuff;
 
  sub new {
    my $class = shift;
    my %args  = @_;
    bless {
      fooAttr => $args{foo},
      barAttr => $args{bar},
    }, $class;
  }

  1;
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If you bless the attribute hash into 'Stuff' rather than $class, a subclass of Stuff (say Junk) which calls the super-class's constructor will be blessed into the Stuff package instead of the Junk package.

If Junk adds/overrides any methods, they won't be called.

Another problem is that it's much harder to maintain a class if the classname is sprayed all over its constituent modules.

-David