It depends on your point of view. According to the video on their blog post, their team thinks it's somewhat broken that you have to keep a mental lookup table

It depends on your point of view. According to the video on their blog post, their team thinks it's somewhat broken that you have to keep a mental lookup table in your head of the contacts in your life and the best way to reach them - who you should send a SMS to in order to get their attention, who you should email, who you should send a Facebook message, etc. They want to provide an easier and unified face for personal messaging. Personally I like the idea.