Much obliged, Mathi. *downs pint*
The thing is, Empire does have a need for an artillery guard that can do more than just sit there and wait for a war machine hunting unit to come close (because it might just run around you), and Crossbows/Handgunners fit the task perfectly. Sure, you can do it with Outriders, but Outriders can and should be off to bigger and better things elsewhere, and they don't count as Core. If you're like me, your army revolves around a big block of Halberds as your center, with 2 units of DGK's on the flanks. You're not bringing much else in the way of Core (an Archer unit to bunker your Wizard, maybe a couple of 5-man detachments to redirect), and thus the Handgunners/Crossbowmen fill a needed niche. I prefer gunners because I already know people will be coming toward my machines and the Armor Piercing helps against Fast Cav, though I reserve the right to change my mind and swap to Crossbows.