[Twisted-Python] setTimeout in Deferred

[Yun Mao]

This is the doc of setTimeout:

         """Set a timeout function to be triggered if I am not called.

         @param seconds: How long to wait (from now) before firing the
         timeoutFunc.

         @param timeoutFunc: will receive the Deferred and *args, **kw as 
its
         arguments.  The default timeoutFunc will call the errback with a
         L{TimeoutError}.

         DON'T USE THIS! It's a bad idea! Use a function called by 
reactor.callLater instead
         to accomplish the same thing!

         YOU HAVE BEEN WARNED!
         """

Any reason why not? It seems to me that setTimeout just calls 
reactor.callLater()

Yun