Well if the NSA does have loads of 0day then it's still better for them to give good security advice to strengthen infra, because it will limit the access adversary's have while they still have all the 0day's anyway.
i.e. they are advanced enough to not need to walk through an open door, so they might as well encourage others to close the doors because that will increase national security (while presumably not limiting their own access).
I’ve been recommending it to various localities after my security assessments for years now. https://apps.nsa.gov/iaarchive/library/ia-guidance/security-...
Having said that, the last thing I tried implementing from the NSA was a simple systemd service to disable ptrace [1]. The provided service definition had at least three errors, and the instructions themselves were incomplete. Not exactly a confidence builder, but I'll take a look at this one so thank you.
[0] https://cryptome.org/2016/01/nsa-16-0114.pdf
[1] https://media.defense.gov/2019/Jul/16/2002158062/-1/-1/0/CSI...
While we maybe could estimate the relative sizes of the groups you mention and compare them relative to each other to guess the strategy/policy/tactics it's not clear that would be accurate; or maybe we could infer based on some heuristic or metric (like budget being a proxy for headcount), and even then it's not clear how certain that guess would be, so it's not obvious how "we all know" it's 99/1 vs 50/50, vs any other permutation.
Push come to shove would probably agree with your premise and conclusion, and really have no idea, so apologies for being nitpicky; without a background on the technical details it's likely I'm wrong.
[1] https://www.logicallyfallacious.com/logicalfallacies/Alleged...
No individual can speak for all readers here on how they view this agency. Attempting to weakens the comment.
(that's another logical fallacy ...) https://www.logicallyfallacious.com/logicalfallacies/Argumen...
I don't buy that they're 50% red team, and 50% blue team. More like 99% red team and 1% blue team.
[0] https://en.wikipedia.org/wiki/Doublespeak