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In addition to, as many people have stated, about the issues with the Empire as a whole I would like to see specific bonuses applied to the two play styles. I would like to see an option to have an elector swear fealty to the emperor aka become a vassal and if you vassalize the elector you get a % increase to vassal income, allegiance points, and some other bonuses. As for the other case of increasing the imperial holdings and subjugating the electors you could get another bonus such as increased leadership, recruit rank, ect. This would encourage two entirely different play styles where you either crush dissenters or bring the empire in line to build a United front. This along with the other changes people have suggested and more events would add a lot to the empire as a whole in my personal opinion.