Here's another reason / hybrid of a couple. I noticed when reading this thread, I selected your comment and then scrolled whilst reading. Allows multitasking an

Here's another reason / hybrid of a couple. I noticed when reading this thread, I selected your comment and then scrolled whilst reading. Allows multitasking and faster scanning - I'm reading the text as the page scroll and the highlight makes it easier, whilst getting ready for the next section below.