iOS 15 takes things up a level. Your phone will remain trackable on the find my network even while the phone is turned off and it will remain trackable for weeks after the battery is "flat".
Sure there are still methods you could use but it makes theft another level harder. The serial numbers and authentication on each part could also be used to brick each part of the phone if it is marked as stolen making them useless for resale as parts.
Sure there are still methods you could use but it makes theft another level harder. The serial numbers and authentication on each part could also be used to brick each part of the phone if it is marked as stolen making them useless for resale as parts.