Hi and welcome to the forum.
There's no disadvantage at all in using a switched connector. If you were to install the socket in a PCB you'd want the extra pins for mechanical stability, even if they were unused. The one in your link is dual-purpose in having pins for PCB use, as well as holes for wires if you mount the socket on a panel. Just connect to the main terminals (in the picture the top row) and ignore the other three.