At first, humans just had speech. If you wanted to say "Ugh" to someone, you had to say it out loud. Sure, you could whisper or shout, add facial expressions and gestures, but your main communication option was speaking. In person.
A few thousand years later, the clever folks of Ur developed cuneiform writing. Then people had two options: either say “Ugh” or write “Ugh.” You said it if the person was standing there, and you wrote it if the person wasn’t. The choice was clear.
Now, after another few thousand years, the choices are anything but clear.