Some riders just need more. As adventures get longer and trails more remote, many riders see increased value in reliability and downhill control.
The bigger tires, plush suspension and powerful brakes of the All-mountain bike are an insurance policy against accidents and mishaps and can be just plain fun to ride. With geometry suited to steep terrain and small drop-offs All-mountain bikes can inspire confidence, however, on more mild terrain they can feel sluggish.
If you are an all-day adventurer or ride harsh trails you may be an All-mountain rider.