This is like saying that handing over a paper note to someone is more convenient than sending them an email, because you don't need to know their email address,

This is like saying that handing over a paper note to someone is more convenient than sending them an email, because you don't need to know their email address, and even if you did you can't be sure whether they still use the same email address. That may be true but most people seem to have decided that the convenience of not needing to transfer a physical item outweighs those problems.