Well, I think print and push are different in that when you see: 
  print;

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it feels like you want to print something, that thing being directly related to the context (default arg) makes sense. on the other hand: 
  push @a;

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feels like we want to push @a to some place... like a stack. If there was a default stack than the right action would be to push @a to the default stack. So, I guess it is more about linguistics than implementation,

In reply to Re: why does push not default to $_? by perreal
in thread why does push not default to $_? by LanX

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