The FBI is currently arguing for point B - just this device. The argument is - it is so close to point A, there is no issue!
If the FBI wins point B, then they will argue for point C. - it is so close to point B, there is no issue!
If the FBI wins point C, then they will argue for point D. - it is so close to point C, there is no issue!
Repeat over and over.
At about point M or sooner an exploit or the extraction processes to the gradually less secure device would probably become available to governments through means legal or otherwise and we would probably hit point Z straight away.
Apple are trying to stop the inevitable by not starting, the FBI are arguing for point B.