The army lists are only for use with the Grand Tournament scenario (designed especially for tournament play as the name suggests).
It is also ideal for pick-up games against unknown,new or regular opponents to help give a balanced game (even if players have never played each other before).This is one reason for the limited type of army lists that are seen in Epic A.
If you own the rule book you should have read the design notes that state players are encouraged to change anything they want to suit their own gaming group.This includes Army lists even for the GT scenario.
You can produce any Army list you want with as much(full codex with every conceivable unit or formation in it) as little (Only 1 type of formation allowed,say Tacticals for a marine list) if that's what you want.You only have to get your opponents permission to use it not GW's or anyone here.
If you all know what type of list/codex you want then just produce it for your on use it doesn't have to have an official stamp here or anywhere.I personally prefer the more limited official list (BIEL-TAN/STEEL LEGION/GHAZGKHULL MAG URUK THRAKA’S
WAR HORDE etc.)
To me these type of lists suit the games design of being large scale battles set in either a certain war zone (Armageddon/Baran etc.) or between certain armies (BIEL-TAN/STEEL LEGION/GHAZGKHULL MAG URUK THRAKA’S WAR HORDE etc.)
They are supposedly easier to balance this way,although armies such as BIEL-TAN have now taken over 6 years to get to where they are now (some still don't think they are finished). How many years is it going to take to get a list that includes everything available in varying formation sizes and most things also available as upgrades.
I don't think I'd be around to see the finished article

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We would then probably get some one come along and grumble that the lists didn't have the formations in size's/choices/ugrades agreeable with them and want to change things.
To those who want full codex list's I would say just go ahead and produce them.That's the beauty of epicA it's your game when you play it at home or with friends so you can (to quote a regular on the forum) DO WHAT WORKS FOR YOU .