The way I see it, the problem is the C in CSS. If you rely on `.author-bio > h2`, then every time you make a change to `.author-bio`, you have to consider all the contexts in which this class may be used globally in your site, and if you change the styles for `h2` even more so. Sure you can say you encapsulate every context with a globally unique id, but since you’re probably already using some kind of templating system for you HTML, it’s easier to specify the styles there. It’s basically the difference between having variables scoped global vs. local by default.