Drawings intended to explain a scheme and to promote its merits. Working drawings may include tones or hatches to emphasise different materials, but they are diagrams, not intended to appear realistic.
Architectural design presentation are the life and soul of architecture. As working drawings is roughly summarised above we need to explain and make the final project understaood by the client via presentation , 3d models or virtual reality. The latter is of utmost importantce for a client to enable them to visualize what there project will look like when completed.
They need to understood the design and reasosn behind it. The architecture project presentation might not be the core of the project, but it surely influences the viewer. It can also be considered as an indicator of your artistic skills and sense as a designer.