I've disassembled LOTS of devices in my time, and never knew this was a feature that could be used after the initial purchase.

For some years now I've known certain devices like laptops won't power on when bought until first plugged in, but I didn't realise that it could be enabled intentionally after the fact.

Typically the first thing I do when I open a device is remove the battery, so accidental button presses (like i-fixit lists) as the reason for it are a non-issue.

Nintendo's Joycons also have this feature https://www.youtube.com/watch?v=CZxwVnLc83o