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
I usually use 7z as well… mostly because of the higher compression ratio. I resend in zip if I get complaints, but if it’s a large file that barely fits in size on whatever hosting service I decide to share the file on, I just tell them to install 7zip or any other archiver that can open 7z archives. If they don’t how to do it, hey I also offer remote IT assistance 🤷.