This is getting out of hand; people on coastlines should be able to have navies if they desire; if not, they don't have to. Nobody's forcing "extra work" on anyone. 

If the RP has no mechanic system, and we're just writing out battles as narratives, in a story format, then navies are no big deal. You just write them in. Just because they aren't "planned for" doesn't mean anything is actually stopping them from being in the RP. We're writing a story, not playing a war game with clearly-defined pieces. Dwarves have gyrocopters; now, not everyone "plans for" aerial combat, but the opportunity is there.

I joined for a RP with Warhammer-inspired themes and military focus, not Warhammer Fantasy Battles with text replacing miniatures. Why restrict ourselves to the limitations of a physical game when we have the freedom as writers to add much more with words?