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  Imagine going to an art teacher and saying you want to paint like Jackson Pollock. You don't start with throwing paint on a canvas. You'd need to learn proper technique before you can understand how to paint like he did. Even Pollock had to do that.
  It's the same with singing. If you want to be a better singer, you need to learn the fundamentals before you can understand how to diverge from them.
  The other thing to consider is that different vocal coaches specialise in different things. There's no point going to an opera teacher if you want to be a rock singer.
  If you want to sound like an untrained singer, you need one of 2 things - a unique and appealing voice that comes naturally, or a good vocal coach who will teach you how to use and control your instrument.
context: It's a vocal coaches job to impart you with technical ability, not necessarily with artistry. It's great to sing with emotion, but when the focus is on learning technique it can be beneficial to take that aspect out of it, as it can compensate for improper technique. You can always put it back in once you are comfortable with actually being able to sing. >
  
  They can also help prevent you from hurting yourself in the long run if you’re singing a lot.