Others have pointed out that discount codes and shopping carts are not mutually exclusive. I would bet that developer resources are directed elsewhere at the moment - support for KV, KT, and reportedly KW - plus the new physical-shipping store for eReaders. And probably this has been true since the beginning.
As a developer I know that broken functionality and brand new features can take precedence over cleaning up already-working items, even those that are a little clunky.
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