Then it goes on to say what you said. Let's not cherry pick quotes shall we?
You're right, in my haste I quoted only part of the rule. I wasn't trying to cherry-pick anything. Mostly I just wanted to correct your assertion that you can roll higher than the maximum value on a die (note how the book defines a d5).
The rest of it was mostly pointing out that the whole exercise was rather pointless, as you don't compare the performance of an unskilled combatant with a good weapon to your expert assassin with the objectively worst weapon in the game.
Personally, I'm all for having tiered weapon lists (40k is particularly suited for it), but trap options, like weapons that exist solely so one can't say "daggers don't exist in DH2," are utterly pointless and bad game design.