Why I only use one lens

Why I only use one lens, well after many years of experience using different lenses, I now have resorted to only using a single prime lens. I started with a 50mm then added an 85mm, 35mm, 100mm and 28mm to my collection, and I’ve played around with zoom lenses. But now I exclusively use a 50mm lens. No more zooms and no more choices. But why would I volunteer to limit myself?