That is nice. I'd probably just use python to share a directory from termux instead.
Problem is that you both need to be on the same network for this to work.
Sure, I could quickly start a hotspot and share that with a qr-code and then share my ip+port with another qr code.
Whole setup is like 6 clicks, but... The receiving side needs to join a wifi (and implicitly disconnect from something they might be using, and then have to switch back afterwards) and scan ² qr codes.
Not many other ways to do it... not relying on a common network is a desirable thing if you ask me (say to share photos with friends while camping without Wifi). At that point, a hotspot wifi network is the only solution I can think of.
Being in the same network, of course, lowers the difficulty bar because now the peers don't need to perform an initial step of creating their own network link between phones.
Apple has airdrop and android has nearby-share or whatever it is called.
And many apps are running their own direct wifi-wifi, tons of ways to do it. No real reason for why it couldn't be native to all devices that exist.
The problem is that airdrop only works with apple devices so that is utterly useless. Nearby-share is equivalently useless.
Hotspot works, but only in some cases. About as convenient as unpacking a laptop and sharing thumb-drives. Which is a pretty embarrassing state of affairs in 2023.
Problem is that you both need to be on the same network for this to work.
Sure, I could quickly start a hotspot and share that with a qr-code and then share my ip+port with another qr code.
Whole setup is like 6 clicks, but... The receiving side needs to join a wifi (and implicitly disconnect from something they might be using, and then have to switch back afterwards) and scan ² qr codes.
All in all, too cumbersome.