My theory is:
When the device is powered off, the Wi-Fi does not even start, how can you wake up a device that is un-accessible.
While for LAN, it's quite a different story.
Waking up a device via LAN requires a device being connected to the LAN via an ethernet cable.
And each device has a unique MAC address.
When you broadcast the "WOL" signal in the LAN, that device should be able to receive the signal (as other devices in this LAN do) as long as that device is in the LAN. Then the device shall be wakened up.
Yes, that is correct. Some MBs provide the "WOWLAN" feature, but this is not common.
Using the Ethernet port is an obvious solution which I will test - it requires an Ethernet router/AP to wake the Minix up, ie an additional device, which is what I tried to avoid. Also makes the Minix wifi interface useless in my scenario. But not a big deal, really.