(Well, that and because it looks really cool.)
With Pebble Communicator you can even type your own SMS using Tertiary Text, an input method by vgmoose which allows you to write using only Pebble's three buttons.
You can read more about Pebble Communicator on its website, www.joaopluis.pt/communicator.
*The purpose of this app is to serve a Pebble watchapp. If you don't have a Pebble (or if you don't have the Communicator Pebble app installed), this app will be useless for you. The Pebble app is available at https://apps.getpebble.com/applications/532c923f7c7760a10c000096 .*
* See the last 30 contacts you texted or who texted you
* Read the last SMS in the conversation with a contact
* Reply to a contact, typing with Tertiary Text
* Reply using quick responses written on the phone app
* Check the sent SMS sent status (for the last SMS you sent through Communicator)
* SMS delivery reports (can be turned off on Communicator's Android app)