If you've ever done testing for organizations before or been on the other side of testing (having to solve issues found), you can appreciate the value of full disclosure of information.
This is a really good description that any QA department, tester, etc. should understand:
http://shrinkster.com/6ss
Being able to completely reproduce bugs is essential to their resolution…I can't tell you the number of times I've received an email, support call, etc. with the "we're having problems, the third step of the form doesn't work" -- yeah, that doesn't give me a lot to go on…