ummm... Oddsville, sorry to point out an error but Eyestitch 2000 was the device developed to sew up mudokon mine workers's eyes. It has nothing to do with the change in slig masks.
The in-game reason the mask were changed was because sligs eyes are on the sides of their head and the old visors made them cross eyed (seriously). The real-world reason was so that they could express more emotion.
If there are wild sligs, which is possible since Oddworld is a big place, I don't think they would waste time with any religion. Originally I pictured them as tree dwellers but I like Kaimana's idea better. They live in swamps and maybe they use the shells of dead creatures for their own. It is an interesting new idea (we need more of those), I will have to think about it more.
And yes, the real reason sligs wear masks is because they are ugly. Which is odd because the pictures of maskless sligs make them look sort of cute... sort of. It makes you wonder what glukkons consider attractive. But just because that is the main reason, I also think that the masks serve other purposes that we don't know about.
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