NSA probably has access. This is a legal and power fight
I can’t imagine anything being manufactured/sold in the US not having an access mechanism for the NSA. However, intelligence gathering is different from legal evidence gathering that can be presented in court.
The FBI is making the claim that they need to be able to get the information and be able to present to the court.
Using a secret vulnerability to gather information is not presentable in court; it’s provenance can be contested.
What the FBI wants is a carteblanche access to everyone’s phone everywhere in the world.
The reality is that the keys will leak and people will lose privacy or may get killed.
Barr can’t guarantee that only the terrorists or the pedophiliacs will be targeted.
Mass surveillance hasn’t made us more secure; the amount of data is huge.