As long as your vocal instrument can function properly and unimpeded, you will have vocal consistency, control, increased range, and yes, a wealth of different sounds at your disposal. By releasing any harmful manipulations, you'll avoid the usual side effects that more demanding music and vocal styles can create, such as pain, strained sound, hoarseness, nodes, register break, weak upper register, and so on. The fact is, that singer did not have great technique, because it obstructed the meaning and emotion of the song. Technique is only as good as it can support, not overshadow, your communication. A singer's role is to communicate vocally through music and to create an emotional effect on their audience.
Some sounds are more appropriate for some feelings than others.
The more sounds you have at your command, the more freely you can express yourself. Performance time is not the time to focus on technique. Your attention should not have to be on how to get your sound, or on whether your voice will make it through the gig. When you step onto that stage, you should already be confident in your ability to play your instrument. Whether you're a beginner or a pro, you deserve to freely use any sound that best conveys your message.