Indeed. Especially since if you bring an iPhone for a screen replacement, you have to give them your pin and disable Find My for it. (At least in the 6S era). This is because they need to run a diagnostic/callibration tool and that can not run on a locked phone.

Naturally I told them to wait a minute to erase my phone, but the technician told me that I shouldn't bother because the phones are kept in a safe anyways. Naturally I have still politely asked them to wait until I erase the phone, but this might not be everybody's reflex.

Edit: clarification, this was in an official Apple Store