Well sometimes they are a bit harder to use

 $selt->{count}++;
 $selt->count++; # I guess that's not gonna fly. 
  # Except maybe if you do something spicy with LHS subroutines.
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But that's not the point. They are much slower. Therefore even if you force (politely ask) the outside world to use the accessors you may not want to use them inside the class. Of course you should be aware of the consequences :-)

Edit by castaway: Closed small tag in signature