Terrible idea. You throw class balance right out the window when you remove all cover. Battleships and cruisers will do better, since they can fire continiously from max range, destroyers will be useless. "But, but...". No. Useless. A destroyer in open water either has to skirt the 10km range limit and fire torpedoes hoping for a super lucky hit (oh, US DDs can't do that), or try to approach and be destroyed (hah!) in one or two volleys. Carriers will not be effected that much, they are usually in open water way behind the front lines anyway.