I agree that a lot of these suggestions are redundant and would just clutter the game. Plus, isn't that what promotions are for, to further specialise your units without introducing an entirely different unit type? For example, why would the game need a "super battleship" when that is easily represented by a regular battleship with several combat promotions? Same goes for aircraft. The game doesn't need an in-air refueling plane, but there can be promotions to extend range. It also doesn't need special strike aircraft/naval bomb ers/etc. That can be accomplished with promotions that give existing aircraft a bonus against armour or ships, etc.