Why doesn’t everyone use text to speech?

Making your story text to speech on Wattpad where it has the audio at the top to read it aloud is as simple as putting the tag #texttospeech in your story tags and it automatically updates with the audio at the top.

Why doesn’t everyone do this? Why isn’t it more common? I love to sit and listen to Wattpad stories late at night and having it read aloud to me. But my favorite stories don’t have the text to speech option

Not to mention, what if people who are hard of seeing want to read the stories?