You are right. I realize I contradicted myself. I guess what I mean is that Bootstrap lowers the barrier for good web design substantially and shares some of Twitter's best known methods. Similarly I wish a big app development company would share some of their experiences and maybe provide some insight on the best way to customize and modify the existing Apple UI elements. For example, I can modify the existing design by using several subviews or imageviews or drawing layers but I don't know which is the best way in terms of performance or if other companies do this.