> A factory reset done in anticipation of a search is not as different from using a duress feature as you believe it is. Forensics software would have clearly identified the device was recently factory reset. It would provide another defense argument by arguing it was wiped for another reason, but whether that would be believed by a court is unknown.

This is where machine-like personal consistency is deeply important to opsec. Not just for technical reasons, but for legal reasons also.

If you wipe your phone before every national border crossing and restore it after every border crossing as a part of your standard procedure for travel, it will be much harder for a prosecutor to argue that you have ever done so in anticipation of some particular search. If your employer's security policy mandates doing so, that is even more evidence against anticipating a specific search. If a large body of infosec/cybersecurity professionals advise a wipe/reset of your phone before any and all international travel, that is further evidence for defense.