The shallow sun angle is the answer to another question: why aren't there pictures from the lunar surface of both Earth and sun? In general the Earth was high in the sky. In general the sun was low on the horizon. The lenses on the still cameras had a field of view of only around 50 degrees -- not enough to get both in the frame.
But there are lots and lots of photographs taken on the lunar surface that show the sun. I don't know why that's necessarily such a big deal, but as a matter of historical fact there are plenty.
Also the star-position argument is naturally contradictory. It doesn't rely on education or specialized knowledge, just on the patience to think things out. The notions, "You can't accurately position the stars in fake pictures," and, "Anyone could tell that the stars weren't accurately positioned," are naturally contradictory. Boiled down to its essence, the argument tries to say that something is simultaneously easy and hard to do.
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