I'm not sure why anyone would want "a holistic view" of the credentials on the instance when they have nothing to do with the app in question. This was an poorly conceived requirement, in that case.
I can confirm that a newly created credential DOES NOT appear on the credential tab. I see THIRTY credentials on the credentials tab and exactly the same number after I add a new one. The new one is not in the list. This begets a new question: Is there a limit of 30 credentials on that page and does the uninformed decision to just list everything now prevent new credentials from appearing? There is no "next page" offered, so as far as I can tell, there is simply no credential created.
Other apps require the creation of a credential and then an input, which is associated with the pre-existing credential. (Those apps, by the way, don't show every other app's credentials. Just say'n.)
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