I have studied with many vocal coaches and several singing methods and continue to do so to improve upon my skills. Every single student has a unique sound and style and it’s my job to help them not only get better but to be consistent. What works for one student doesn’t necessarily work for all. As long as the approach isn’t damaging, it may help you out. I have tried some pretty zany ideas on my students that have actually worked!
Don’t get yourself caught in a vocal method net. Or do - if it works for you! There are thousands of amazing teachers all around the world. A vocal coach should be secure enough in his/her knowledge and shortcomings to never feel threatened by any other vocal coach or methodology.