I'm not saying you have to learn Barbershop to be a great a cappella singer... but I am promising you if you do sing Barbershop, you'll be better than if you don't.
The most important thing is that singing is communication, and you need to say something honest and real.
There are times in life to play it safe. I'm sure you can think of several. Music is not one of them.
Great emotional singing isn't a destination, it's a journey, one to be taken time and again to different places with different moods and different audiences.
There is nothing more compelling than another person.
You can't create great vocal harmony without interpersonal harmony.
The human voice was the first instrument and remains the most powerful and effective method of musical creation and emotional transference.