In reply to Justin Tadlock.

Underlines (typically for titles or emphasis) and justified text are remnants of the print world that have never worked well for the Web. Having them available in default WP has meant that new users are given features that are non-standard, which is something we should always push against.

It's a button. And I disagree. That being said...

Be careful comparing the wonderful world of WordPress or a WYSIWYG editor with the century-old, methodical, art and craft of: writing composition, language, typesetting, communication techniques and style guidance. I won't digress 1,000+ years. Just the other day I underlined something. Just the other day I justified a call-out. And so did/will millions of others.

This "Web" you speak of is a mere extension of the "Print" (or Publishing) world which will still exist for the next 100 years. The Web has made every attempt to mirror/simulate Print in so many ways and will continue to do so—regardless what a publishing platform has to say. As for an anchor's disruption for hyperlinking, well that can err on the side of Accessibility standards.

Since I just love discussing buttons ...I usually believe one-less-button is a good idea and promote this change. But adding/removing a silly button has nothing to do with Print vs Web. Print never underlined a zillion xrefs, the Web did that.