This assumes a hotel room that uses NFC cards rather than magstripes (and this is well-used tech as it's used in secure door checkpoints--think HID). In which case using the phone means one less thing to lose (and I've seen plenty of hotel keycards strewn on the street). Sure, the locks can be reset if you lose your card, but that involves going back to the lobby and all that rot.
Biting the hand that feeds IT
