Like it or not, the lead vocalist is the focal point of the band.
In one of my bands Angel Of Sin, we achieved a lot of success by throwing out about half our songs and concentrating on songs that suit our singer, and that she could sing well. That meant ditching almost all of the punk songs and songs that required very quick vocal delivery. The band is a lot stronger as a result, even though I don't get to jump around like a loon quite as much.
Jon