All told, HTML is a versatile, adaptive, and quite obviously widely-used markup language. Without it, the World Wide Web wouldn't be. We'd be stuck in the dark ages of newsgroups and bulletin board systems. But HTML isn't the patron saint of the web. HTML has its down sides, no doubt about it.
Complex tables can take a while to render.
Images embedded within the resulting page download much more slowly than plain text does. Email should be text - plain text. Before any serious discussion can be had, it's important to know just how darn big email is. 12.8 million U.S. households have adults who use email from home. 53 percent used the Internet for email during their last session.