> No, there are lots of use-cases at least for LAN communications. What I'm trying to get at here is that bizarre sidechannels like fan noise or SATA EMI are o

> No, there are lots of use-cases at least for LAN communications. What I'm trying to get at here is that bizarre sidechannels like fan noise or SATA EMI are only relevant when the system administrator has thoroughly locked down all other possible channels of communication. If the system is connected to a wired network, it can communicate with other systems over that; if the network is connected to the Internet, even indirectly, there are probably ways to get data out through there. If the system has a WiFi card or Bluetooth adapter, that can be used to transmit data, even if there isn't an applicable network in range. Etc, etc.