Device-to-Device File Transferring
Coming off of the Bluetooth Panel redesign the only out-of-the-box way to share a file to another device is over Bluetooth and to start one of those file transfers you have to go digging in the Settings panel which is less than ideal when you're just trying to send a file to another person/device.
It would be nice to have simple device to device sharing of files that is as straightforward as some of the methods you can find on the other platforms.
The Other Guys'
All these things seem to operate in more or less the same fashion using a combination of Bluetooth and Wi-Fi to transfer files between computers/devices.