Does the question not hinge upon whether you are discussing the primary instrument for CONTROLLING pitch atttiude or the primary instrument for assessing pitch PERFORMANCE?
The altimeter can not tell you what pitch attitude you have other than to tell you if it is: 1) right 2) too high or 3) too low.
By the way - are we really going to use the FAA as the definitive source of all that is right with technical questions? Hope not!