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Hackers use Wi-Fi invisibility cloak
Out of the box, Wi-Fi hardware is designed for ease of use and not security. Basic Wi-Fi implementations include some security controls, and while far from perfect, they do provide a deterrent to hackers. However, unless the security controls are turned on, they're about as useless as a screen door on a submarine.
Wi-Fi also completely changes the concept of physical security. In a wireless world, security guards and surveillance cameras count for very little.
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