Isn't it also naive to think China and Russia weren't fully aware of the NSA's capabilities? If anything the only effect it had on intelligence agencies is it accelerated the smaller countries towards this type of mass surveillance, they learned thoroughly what was possible - beyond what you can buy at miltech trade shows. And now we see many awful countries mimicking this type of stuff now, like in Ethiopia.

But otherwise for 99% of it the only one it was new and valuable to was the public.

As good as the FBI/IC is at counter-intelligence if Snowden can do this stuff I'm sure a highly trained spy recruited by any top tier agency could get similar access.

Also notably Snowden did not leak the really sensitive TAO stuff, which was well compartmentalized. He mostly leaked spreadsheets for the 'middle management' in NSA. I'm sure he only revealed a small portion of their top-teir capabilities. And the stuff he did leak was almost always very vague, often just a few bullet points in a spreadsheet was all we had to work with...