I never understood why the repair techs need my passcode to repair my iPhone (like replacing display or battery) and they suggest it as a first option unapologetically without even explaining privacy risks.
Recently I had the screen replaced on my child’s iPad. The tech asked for passcode, and I refused to provide it. The tech complained and said when I came to pick it up he’d need to guide me through some things.
Indeed, there were some settings that needed to be set, to ”help” the new screen.
Having said that — I’ve previously documented a case (well over 10 years ago) where I caught a local PC repair company who used their access to a machine of mine they were repairing - to quickly scan through the thumbnails of our personal photos, and look closer at any image which showed any flesh.
People expect to be trusted but don’t act in a trustworthy manner.
I used to repair iPhone screens and can answer this. It was the easiest way to check the device worked after the repair and that the screen didn’t have any dead spots. We told people to wipe the phones before they brought them in, and gave people the option of either giving us the PIN code or accepting the device back without us validating the fix.
I don’t think I ever had a single person say no to the pin but we did have plenty of people wipe the device before they brought it in.
There are also stories of people losing all of their stuff by sending the device in. So the added benefit of suggesting a wipe is that it encourages you to assume total loss and plan ahead.
That doesn’t necessarily help with people sending in devices with special nostalgia for the physical hardware, such as a signature. Though whether those sorts of issues were from not paying attention to notes attached to the account or outright theft has rarely been clear.
Maybe the benefit of only ever dealing with extremely sketchy places for phone stuff is that they already know I won't give them information to unlock my phone so they never ask. Either the repair can be effected without, or I don't want it done. "Is it OK to wipe this phone?" is also an acceptable question, and sometimes the answer might even be "Yes".