And what about the situation in which FBI writes the custom OS and then force Apple to sign the update?
https://lieu.house.gov/media-center/press-releases/congressm...
It's Ted, not Tim, Lieu BTW.
No one is compelling apple to weaken their encryption scheme because it is already weak. They are just asking for them to weaponize existing weakness (the weakness being apple having the ability to update the software on the device)
It will be somehow worse than Apple software