1. Shelob didn't come out because of the light, and she also didn't have a reason for coming out, after all she caught orcs and other creatures crossing her way. So why should she leave her save place? I see no reason in it at all.
2. In my opinion, Shelob was weaker than we think. Even a hobbit was able to frighten her away, so she could be killed easily by a couple of men. If she were as big and mighty as Ungolianth, things would be different.
3. Sauron could have replaced her easily with some Orcs. They would have been much more dangerous, maybe they would have even stopped the hobbits.
Another question is: Why didn't Shelob capture Gollum when he was crossing her lair?
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