Not true, Oreo - he'll still need the original Powerbook Install disks to replace iMovie, iDVD, GarageBand, GraphicConverter, and whatever other extra software was bundled with the 'book.
But yeah, a complete wipe anc clean install should not be necessary.
Heck, the last time I did a complete format and reinstall on one of my machines (barring defective or replaced hardware) was in 1990!