Wouldn't that mean you lose one of the reputed benefits of TDD: writing tests as a way of exploring the problem space, informing the design of the code under te

Wouldn't that mean you lose one of the reputed benefits of TDD: writing tests as a way of exploring the problem space, informing the design of the code under test? More generally while there is a place for testers that are at arm's length from the implementation, giving the implementor some of the testing responsibility (TDD or otherwise) has the benefit of investing the implementor directly in the QA process.