alt Hacker NewsLow.
While the NSA would, absolutely, use it to elevate existing internal access - it is such low-hanging fruit that they have enough alternative tools in their arsenal that it isn't a particularly big loss. Most of their competent adversaries disabled it years ago (as has been best-practice since 2010~).
More likely, it is Microsoft's obsession with backwards compatibility. Which while a great philosophy in general has given them a black eye several times before vis-a-vis security posture.
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There are tons of old printers/copy machines that allow SMB access or AD auth that will never see a software update that will break.
Honestly I blame the copy machine manufactures for requiring service contracts for security updates on a lot of this.
Microsoft supporting something doesn't mean that you have to use it. There's something as personal responsibility.
Most importantly, the NSA is not just about spying, it is also about protection.
A weakness anyone can exploit in software Americans use is not a good thing for the NSA. If they were to introduce weaknesses, they want to make sure only they can exploit them. For instance in the famous dual_ec_drbg case where the NSA is suspected to have introduced a backdoor, the exploit depends on a secret key. This is not the case here.
On the other hand if Snowden has shown us anything, it is that the NSA is more stupid than it looks.