I'm aware, I just don't see the appeal in it. If you want to send someone a text just send them a text.
Why do you need to use the same messaging service on your computer as you do on your phone? You can talk to someone on BBM or SMS with your phone then message them on Facebook when you get to your computer, it's not complicated.
First, the appeal is in the fact that you have one app for all communication instead of having to jump back and forth b/w apps and know which of your friends are using each app.
Second of all, you really don't see the benefit of being able to use a computer as a means of communicating via the same channel? Let's say I'm messaging with someone on my way to the office. When I get to work, I can then pick up the exact same conversation with all the information (and past text) right there, from my desktop computer. Aside from the fact that I can then use my computer while I'm at the office all day instead of having to pick up my phone every time I need to get in touch with someone, I can easily have real time communication with any of my colleagues or friends while also preserving my phone's battery life.
I also know that I can communicate with ANYONE using Hangouts (once it integrates with SMS) whether they've downloaded the app or not. There are tons of other more obvious benefits that I'm sure you can figure out.