There are lots of other perfectly ways to communicate over the internet, so why should you use Twine messages? Well, you don't have to. In fact, we would always encourage you to use whatever is the best tool to discuss the job with your client, whether that's phone, email or in person.
Twine messages are very important as a record of the scope of the job or the project requirements. This is a clear communication stream that will help you if there are any disputes. We highly recommend you message a client with a clear scope, or list of requirements, of what you will be doing for them.
This way both you and the client are on the same page. Then when you send files, make sure you send them on Twine, again as this is a clear record for both of you.