Why do some of the Black Crusade materials want to have bad guys perform at less than their optimal ability? As two examples:
1) The section on Hordes (rules that I think are terrible and unneeded, but that's beside the point) indicate that Hordes are only to be used against Chaos Space Marines. Apparently the ability of several lowly combatants to form a gestalt of badassery is lost when it might allow them to overcome lesser opposition even more effectively.
2) The master villain of the example adventure knows the Bolt of Change power. This guy really wants the PCs dead (DEAD!), but he'll only use Bolt of Change once during the final battle because it's so horrible. WTF?
PCs have ways of avoiding and/or recovering from death (muchless anything short of it) in this game, so why should the GM have the bad guys hold back when it doesn't make sense for them to do so?