Formatting web content: that's the new CONTENTED course I'm working on at present. And it struck me that every WYSIWYG editor has good buttons and bad buttons.
Good buttons tell us something about the function of some text.
The bad buttons exist just for text-decoration. Only use them if you don't mind your content looking naff. In other words, use them if you are doing your own thing. Steer clear of them if you want to create a professional impression.
One of the most painful problems confronting web editors and managers is the staff member who thinks they are improving on the site design when they fiddle with FORMATTING.