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I think it's a matter of cost as well. The shuttle was a technological marvel but proved expensive to maintain and security issues emerged. They had a few hiccups on one re-entry and one launch with "worn out" equipment. They do take a serious beating everytime they go up and come down. Re-using stuff is good for the side powder rockets but didn't seem to work in the long run for the main vehicle. The Ares vehicles are more conventional, simpler, less prone to failure I'd say.
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