I am using ArcMap 10.4.1.
I have been learning about the subject of coordinate system concepts such as datums, transformations, projections, maps, grid, ground, etc. While developing practical exercises for myself, I have come to the realization that ArcMap may be my only resource for properly transforming and projecting between different coordinate systems. For example, I learned that AutoCAD does not really think in 3D such as the case with interpreting a true geographic coordinate system. In fact, the world WGS84 datum would be visualized in AutoCAD as a flat plane, even though it is not projected. So locating points and transforming, for example, between a State Plane coordinate and WGS84 is not possible. However, I assume the ArcMap software is not working in a "flat" environment like AutoCAD, and can correctly interpret between a 3D Geographic coordinate system and a flat State Plane projected coordinate system ?