I don't see how you get a security through obscurity angle out of what you were replying to, assuming you are referring to the well known cryptography saying.
That's not what "security through obscurity" is about. The admonishment against "security through obscurity" in cryptographic circles is about not relying on your adversary's ignorance of your systems to protect your secrets.
So, for instance, if you are using cryptography to secure a transmission, you don't rely on eavesdroppers not knowing what algorithms and protocols you are using. You rely on them not knowing your keys.
Also, the ability to classify nothing is preferable to the ability to classify anything as the power will be abused with increasing extents.