There has to be a watchmaker--it is an axiom that can be useful along the line of that approach. The postulate does not imply a beginning, nor does it exclude evolution as a natural function of the watch, to be a little Hegelian.
Right, there has to be watch maker. A human being is much more complex and intricate than this computer, no one would ever suggest this computer could just "happen". No one.
That is a limitation put on the process by the human thought process. A watch is made by a watchmaker therefore man was made by a manmaker.