Don't worry about derailing, it's not really a topic of conversation but an issue that's afflicting Scoundrels.

Man-at-arms skills don't require a specific melee weapon, while scoundrel skills are restricted to certain weapons.
Were I able to use a scoundrel stun with a nice battle axe this issue of dagger would be moot, but alas, dex skills need a heavier restriction than str ones.

Now obviously the restriction could be scaled back to a melee weapon requirement, but I'm sure there's a reason why dex players need to work harder.