

Honestly, this is an easy way to share files with non-technical people in the outside world, too. Just open up a port for that very specific purpose, send the link to your friend, watch the one file get downloaded, and then close the port and turn off the http server.
It’s technically not very secure, so it’s a bad idea to leave that unattended, but you can always encrypt a zip file to send it and let that file level encryption kinda make up for lack of network level encryption. And as a one-off thing, you should close up your firewall/port forwarding when you’re done.

Thread is a bit more power efficient, which matters for battery powered devices that aren’t connected to permanent power and don’t need to transmit significant data, like door locks, temperature/humidity sensors, things like that. A full wifi networking chip would consume a lot more power for an always-on device.