Like when you send a .7z instead of a .zip or .rar to a friend or a teacher because that's what your computer has installed and they're like "Oh No, not one of those, now I have to install 7Zip" even though the same program that opens .rar also opens .7z I feel like people are way more annoyed when they receive a .7z
Lol company I work at unironically has this as a suggestion for securely transfering sensitive data instead of cloud stuff. Although I think it's more of "please learn how to use our secure server, I'm begging you" thing.