It overlaps with other features, and if it's on by default nowadays, I guess it can be counted as a bug then. There was a separate commodity for this earlier and laptop users could use it, but it has been moved to system prefs now, which is nice, but it shouldn't block any other feature especially when it's useless for any other than single button mouse/pad users. It would be nice if some other qualifier key would be selected for the default key :)