"EXACT same thing as you're saying"
You've got to be careful when you say things like that, because they're trivial to refute.
The whole point of a backdoor is to be obfuscated and hard to find. So it would be very likely that you would not find one even if one were present. Your example is simply a Microsoft not bothering to do something that's perfectly researchable.
We don't have any _proof_ that Dual EC DRBG is defeatable to the NSA. By your logic we should still be using it happily until we have that proof and until then any caution is simply "FUD".
So if that's "FUD", then I've got news for you: the security world is very sensibly built upon FUD.