Why is WYSIWYG important for software localization?

If you are new to software localization and visit the web sites of software tool vendors, they will tell you that What-You-See-Is-What-You-Get (WYSIWYG) is an extremely important feature. We all know it is important for desktop publishing. WYSIWYG editing eliminates the need to print a flyer again and again to see how changes look. But [...]