That and a driver can find fairways and still be unforgiving if it loses a lot of ball speed on misses. Personally speaking I don't find forgiving drivers to be that much straighter or more crooked than unforgiving drivers, I just tend to notice larger dropoffs in distance when I miss.
Or this example: lots of people find Ping G30s hard to square because the head is so enormous, and lose them right a lot. Now that's the most forgiving mainstream driver in the world. But for those people the retained ball speed just puts them even further in the right rough, or OB. Is that forgiveness?