when a plug is inserted into the TRS socket, the tip and ring are temporarily shorted out which brings the system down on that other device.
Can you explain this again in more detail please? The socket will have 3 sprung contacts designed to make contact with the tip, ring and shield of the jack. When the short happens, is it caused entirely by the tip of the jack, or are the ring and shield also involved somehow? What is the path of the short circuit current, starting from the 5V socket contact, where does it flow to get to 0V?
there would still be a live 5V and ground on the cable plugged into to the socket, that a user could accidentally short.