Knowing enough information to receive a key should the identification procedure be bypassed doesn't necessitate knowing the person. Checkout dates and name are usually confirmed at checkin. And countless times have I overheard a person's room number through conversations they're holding at the front desk, concierge desk, or in the club lounge. Being of sound mind, and not criminally inclined, it goes in one ear and out the other, but it could easily allow for someone access to my room should they so desire. I'm not saying it's an everyday occurrence, but neither are hotel murders, and t it could easily turn into an incident, so with preventative measures being so easy to take, it doesn't make sense to ignore it.