Chats are excellent alternative means of communications for people who can benefit from augmented communication, like the deaf or hard of hearing, or people with social anxiety, or folks who simply lack the ability to communicate verbally but are perfectly competent and able to use their "voice". Besides that, your personal views about how useless chats are may just be an indication that you have deficiencies that prevent you from benefitting fully from text communication. And I don't see how you made any connections with specific demographics who use chats or messaging, other than your personal biases. I frequently use messaging with my coworkers and clients because it's extremely efficient. And look. I'm employed.