Really, it seems to me that the bike's ability to handle touring loads (along with things like gearing and wheel strength) would be the primary focus of a touring bike. Utility bikes can haul more, but they aren't designed to be ridden long distances. You *can* load up a lesser road/hybrid bike, but it will not handle nor last as long as one made for touring would. That doesn't mean you can't, but there are trade-offs.

You could use a hybrid for light touring, but for a 2-month-long tour through the countryside with a full load, they will leave something to be desired. Most of the hybrids I'm seeing now are either just thinly concealed flatbar road bikes, or IGH city bikes. I wouldn't want to tour on a lightweight road bike... but I could see doing a tour on an IGH city bike if it's of good enough quality and strength.