I'm with Silas. We have only grown accustomed to Amarr being the second drone race because they had the arbitrator (and its variants), and then got the sentinel on the same model, and to complete the loop, they got recently the battleship as well. I'm not as much as annoyed by that because of :arbitrator: but when you look at dronebays, except for amarr droneboats, they are the third race after the minmatar.
But seriously, the Amarr navy is far from constituted only by slaves... Only a part of their ships are slave manned, and slaves are certainly not going to be let at important positions in navy ships.
Also, I think it is a fallacy to consider that because there is somehow a shortage of slaves or crew or whatever, that drones have to be used instead. They can perfectly well fire automated turrets instead, which is what the Amarr do well, being the second more "crew light" civilisation after the gallente.
As for the Armageddon having always been a droneboat, I would say that's patently a slippery slope. It is better imo to consider that it went through a complete retrofitting recently by the navy as a modernization program, as it might happen for most ships anyway to explain balance changes every patch.
EDIT : I was also thinking along the lines of new heavy EW direction to sansha ships. Like double/triple ewar with the already good chunk of med slots they have, which would give them some kind of unique flavour of armor tank with racks of EW. Or maybe a mix of EW with anti missile TDs, or ECM bursts bonuses for pure brawling fights ? Silas idea around MJDs is nice too. MJDs + ECM burst combos ? TD bursts ?
Also, I didnt know that ECM drones became obsolete... ? When I still used to pvp, they were kindof OP and everyone was complaining about them...