What types of building information are best portrayed in 3D views?
Angles, lighting (shadows), and colors are best portrayed in 3D views.
2D views are useful for construction planning/permitting, utilities layout, and callouts of all the components in a room. (3D will probably hide a corner/side of the room, limited view)
Give examples of how the building information for a specific location in the project needs to be filtered for different audiences and purposes?
Take a bathroom for example:
The owner wants to see the bathroom furnished and decorated, so the fixtures, countertops, and wall/floor tiling (or other finishes) will be important to include.
Plumbers will want the decorative finishes filtered out and focus on the drainage slopes and water inlet/outlet locations. They might still want the plumbing fixtures such as shower/tub/toilet/sink. But they're not concerned with curtains/windows/counter finishes.
HVAC will be interested in the location of ventilation around the room (duct spacing, etc).
Electrician will want to see the conduit routing.
The GC will benefit from having these different aspects of the bathroom split up into different drawings/views.
Including all the details, unfiltered, in one drawing will make it very cluttered and hard to identify conflict areas in any one particular discipline.
Should your design ideas always be conveyed through photorealistic renders?
Design ideas can use Sketchy Lines to appeal to the owners that the BIM model is still a work in progress and subject to collaborative editing with the owner/other stakeholders.