[mirimir]

Yes, the precedent is the key thing here.

Let's say that Apple crafted an update that does what the FBI wants. That in itself wouldn't put other iPhones at risk, as long as a signed copy of that malicious update didn't leave Apple's custody. The FBI hasn't even asked for that. They say that Apple could do all the work in house. Furthermore, it's unlikely that this malicious update would work on newer iPhones.

But the precedent would be established.