[TeMPOraL]

Wi-Fi can, and will, send data behind your back even if you're not connected to any network. Some of it is a part of normal protocol operation (and can be used to track you). Malware on your system could initiate connection without you knowing. And then a malicious actor targeting you personally may spoof a network you often connect to (e.g. local coffee shop) and exploit the default autoconnect to known networks behaviour. Hardware switches protect you from all the above.