I think the structure of writing everything in 2 or 3 days in the week before the show is part of the problem. I know they have to be topical, but there is no reason they can't be writing non-topical skits all year around.
The writing environment is also very political. It is a competitive atmosphere where writers and performers push to get their stuff on. It is safer to keep bringing back repeat characters than try something different or edgy.
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