Why isn’t (>>>) a method?

[Isaac Dupree]

Wolfgang Jeltsch wrote:
> Hello,
> 
> I wonder why (>>>) is an ordinary function instead of a method with a default 
> implementation based on (.).  The latter would make life easier in two ways.

But if you don't add some "instance Category...where 
(.)=...; id=...", then there are still problems! so 
compatibility is still an issue.
and I have to say that your suggestion twists my mind a 
little bit.  after all, Category is the super-class now.

-Isaac