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Sewing lycra? Can that actually be done?
Pushing a needle and thread repeatedly through fabric is probably not going to trouble me on the 'difficult skills' front but I'm not likely to be carrying needle and thread unless I am very remote in which case I'll probably have spares rather than deal with repairs.
hippy-
What if all your spares split down the arse? What then?
Edit: I'm just joking really. But bag/shoe/clothing/tent repairs could be important on a ride one day. You could probably stitch together a tyre that's totally shredded or a sew up a wound in the worst case scenario. Worthwhile skill and a needle and thread probably weighs only 5 g if that. You're right though, poking a needle through a bit of fabric isn't hard and you don't really need to learn anything to do it.
frankenbike
Alpkit sew stuff
Anyway it's the sort of skill one might need if one's bib shorts split down the arse whilst one is doing an unsupported solo ride through Mongolia or whatever