all writs is not applicable
to envoke the All Writs act to force assitance you must meet the 3 tests
the last one asks "is this necessary"
in the case of AAPL: no: it is not necessary
all that needs be done is: have the cops FedEx the "subject device" to Cupertino; include a check to cover the costs, and a copy of the search warrant as required by law .
AAPL can the give the feds/cops the data they demand without releasing a backdoor package . cops that lose their personal side arms in bath rooms and leave them in cars in front of the white house and hang out in the brothels of Colombia cannot be trusted with sensitive software .