It's not a dumb question. Video switching gets complex in a hurry, and newcomers to all of this can easily get lost in the maze. The 990's DVI switching is limited by hardware on what it can do - adding the ability to transcode analog video to digital for use with the DVI output (the only way to get either the OSD menu or the analog inputs routed to the DVI output) while maintaining the DVI signal quality and the unit's HDCP-compliance would be a costly bit of added hardware.