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"Easy-slay(TM) is a whole new way of marketing violence. It cuts down on all the red tape and just butchers people. As a long-time savagery enthusiast myself, I'm very excited about the synergies that the easy-slay(TM) approach brings to the entire enterprise." -Dr DrP
For thematic reasons. Has nothing to do with playability
And it would only affect territories they have dominion in. So it'd ruin coastal provinces, but it shouldn't be too difficult for competent players with amphibious SCs to fight back.