Many pop singers are under the assumption that vibrato is for classical music, or for Broadway or oldies singers. But, this is completely untrue! In fact, without a controlled vibrato, you open yourself up to vocal fatigue and injury.
When you can master different types of vibrato like the “wobbly” or “machine gun” vibrato, you open up your voice to explore different genres and styles that you otherwise have been unable to sing. Vibrato is a necessary coordination that you need if you want to sing with a good tone and style.