Just like the rest of the government, the NSA is not a monolithic entity with no separation of concerns. There are people who clean the floor and people who are at the extreme cutting edge of research.
Don't let anyone convince you otherwise.
The belief that the NSA is at the extreme cutting edge and just so far ahead is exactly what stops us from making iterative, simple improvements on the technology we use. It's plain unhelpful, and as the data suggests, probably wrong.
(The separation of concerns part is hilarious. Remember, this is the same agency where Snowden managed to wget -r their wiki and various other databases and then go on an extended vacation unnoticed.)