It would be great if Esri can provide an editor with all icons of various products. Using this editor users would be able to create their own architecture / block diagram while planning for an enterprise level system design.
It would also facilitates various checks before finalising the diagram, so there won't be any scope for errors such as component "A" cannot be connected with component "B" and so on.
It would help users to produce similar diagram as Esri does, so there will be similarities always and standards will be maintained. Otherwise we always need to copy-paste icons for creating the diagram.