One scenario I can think of: When there's an occasion where you want to give them unlimited time, but you don't want to disclose the code and then later have to reset it to something new. Or you want to delegate permission to a babysitter.
You just give them the doohickey and ask for it back later. (Cloning the NFC tag is a much harder job that remembering a PIN.)
>>Heatra+77
That seems like a rather unfair comparison, tarring "parent won't let child watch movies after bedtime" with the same brush as "international megacorp sabotages hardware you own in profit-seeking paranoia."
Heck, in many jurisdiction the device is owned by the parents anyway, not the kid.