You can't build a skyscraper, or an aqueduct, or a road without a project, or a design. An engineer can tell you how your network can be installed and configured, or which protocols use for what tasks. An architect can tell you why a network should be designed in that way and suggest changes based upon your needs. An architect can explain why those protocols make the most sense in your specific circumstances.
A security architect should have the ability to assemble and disassemble pieces of knowledge to/from a whole and provide to the customer implementation and management guidance based on technical activity prioritizations that include evaluation tests and metrics such as those identified in the CISSP Security Controls.