How do you discuss something that you are not allowed to talk about?
"IMO things that legitimately merit classified status should not be declassified just so we can talk about it"
Which is exactly why secrecy needs to be narrow and carefully applied in a democracy. Troop movements during times of war are an example of something that is rightfully kept secret. The fact that we are at war is not something that should be kept secret.
The problem here is that we have a program that broadly impacts our civil rights, that impacts the rights of foreigners in their own country, and which is being conducted in secret. It is not merely that the NSA wants to keep its techniques secret; this is an attempt to keep the fact that the NSA is conducting surveillance secret. That is very far over the line of "legitimate classification."