Why was this downvoted? This is a clear shortcoming I noticed on ios 4 before I switched to Android. Safari doesn't reflow text on double tap and you have to scroll right and left to read an article. From a usability perspective if I double tap on text I want to do some reading and it should be reflowed. The reader button in ios 5 rectifies the issue but it is still not as natural as reflow text on double tap.