IMHO because this is _current_ implementation issue
you cannot be sure that some/all system catalogs will not change
in the future - making your program _very_ unhappy :)
postgres@taifun.interface-business.de wrote:
>
> > Btw., although direct UPDATEs to pg_shadow will seemingly succeed, you do
> > not want to do that. That's a bug.
>
> Peter, would you explain your statement please!
>
> Why somebody is able to UPDATE pg_shadow to create an user if that's a bug?
> And _why_ that's a bug?
>
> Gerald
>
> ************
--
Marcin Grondecki
ojciec@mtl.pl
*** I'm not a complete idiot - some parts are missing