I remember a while back some newer Dreamcast emulator announced that they now supported bumpmapping and showed how Rayman 2 of all games used it extensively for the levels. Makes me wonder if alot of Dreamcast games used certain features and they simply went unnoticed. Then since allot of people usually say it can't be done on the DC people just don't look for it. I mean I read on another forum how the Dreamcast wouldn't have the power to do real time shadowmapped shadows but then there's a game like Matt Hoffman bmx using it. A middle ground of some bumpmapping maybe the shadowmap and constant motionblur and cross-fades like skies of Arcadia and u got yourself games that would've resembled the other 3 consoles.
Rayman 2 with and without bump:
Video:
Mat Hoffman bmx shadowmap: