You have to remember we are talking about wifi here. You are correct in a wired network but the last hop can be thought of as a hub. All of the packets will be routed to the AP and the AP will broadcast them to all devices it's the NICs job to accept or reject the packtes and even if the MACs match as the packet moves up the OSI model they will be dropped by the legit NIC and yours will move the packets up. Now on a wired network you are correct lots of packet loss depending on L1 switches vs L3 switches, routers, etc.