Or for that matter, why are the submarine fleets and operations of any nation that isn't Germany in WWI almost entirely ignored (I'm referring primarily to Austria-Hungary in that regards)? I was given a couple volumes of The New York Times "Current History of the European War" which is an anthology of newspaper stories and articles covering WWI, basically as it happened. In it, I've made some remarkable discoveries.
One story is by the French Rear Admiral Degouy on the variety of submarines that are in use, and that would need to be designed and used.
Other things I have seen in these four volumes have been accounts of Russian Submarines in the Baltic (sinking German ships), and an account from a British Lieutenant Commander who was operating in the Baltic - and gave an account of being chased by German destroyers, and sinking a German ship.
So I guess I go back to my question, why have these operations been seemingly forgotten by history? Or have I just not been looking close enough?
On the one hand, yes, Allied sub operations in WWI are under-served in the popular literature. This is mostly because they're not as exciting, as sexy, as their German equivalents. The British submarines spent most of the war carrying out patrols of the Heligoland Bight, watching and waiting for the German battlefleet to come out of its bases. This was thankless, tedious work, and little came of it, as the German battlefleet rarely left the safety of the Jade estuary. The Germans submarines had a much more exciting task, trying to cut the convoy routes that linked the UK to the rest of the world. This was a target-rich environment, as the British had to keep shipping in food, raw materials and munitions. This meant that there were hundreds of lightly-armed merchant ships that could be targeted (and until convoy was introduced in May 1917, these were poorly escorted). This was seemingly an existential threat to Britain - if more than 700,000 tonnes of shipping were sunk each month, then Britain would starve. The British subs didn't have, for the most part, such opportunities. The British carried out a surface blockade across the North Sea that caught most of the ships trying to reach Germany with contraband. This meant that British subs had no chance to rack up the huge sinking counts that their German equivalents did. The sole exceptions were the British submarines in the Baltic, targeting the ships carrying iron ore from Sweden, and the Allied subs in the Sea of Marmora, disrupting Ottoman shipping. The other big use of British submarines was hunting German subs, as they transited from Germany to the Atlantic shipping lanes.
However, most comprehensive treatments of the war at sea will cover Allied submarine actions. As an example, Robert K Massie's Castles of Steel contains some discussion of British sub actions. Similarly, Lawrence Sondhaus' The Great War at Sea talks about the British subs in the Baltic and in and around the Dardanelles. There are also a few books that solely cover the Allied submarine war. Innes McCartney's British Submarines of World War I gives a basic overview of British sub classes, and of their main operations. Edwyn Gray's British Submarines At War 1914 - 1918 is an older look at the war, but well worth a read.