Indeed, I don't expect my Bering Sea or Vladivostok, or Baltic defenses ever to fire a round in anger. No one sane person would venture their fleet near such a powerful concentration of precise and lethal guns.
Coastal defences haven't really proven to be that useful in history. Big guns weren't that effective really.
Check out the battle of the Irben Strait, in the Baltic, August 1915. Two German dreadnoughts with escorting cruisers, against the Russian predread Slava. Despite the German dreads having five times Slava's gun power, those mine and shore equalizers made it slow going.
Then in 1917, the Germans made an even bigger effort, with Moltke, Third Squadron - Konig, Bayern, Grosser Kurfurst, Markgraf - and Fourth Squadron - Friedrich der Grosse, Konig Albert, Kaiser, Kaiserin, and Prinzregent Luitpold - against the Russian predreads Slava and Tsarevich. That's 10 German dreadnoughts against two Russian predreads, coast artillery, and mines. Slava was eventually sunk, after a prolonged game of hide-and-seek among the islands and mines, but given the disparity in force, it was a respectable performance.