Initially it is more difficult to create a good layout with a big font size, but that difficulty will help you design a simpler, clearer site. Cramming a site with information isn’t difficult, but making it simple and easy-to-use is. At first, you’ll be shocked how big the default text is. But after a day, you won’t want to see anything smaller than 100% font-size for the main text. It looks big at first, but once you use it you quickly realize why all browser makers chose this as the default text size.