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The fact that they removed it is undeniable :(. However, I disagree with the statement that they were useless. A well-developed ballista in the early game could accomplish a lot. And if the Elves are lucky enough to develop an enchanted ballista, it will be truly magnificent. The tent isn't just for healing a level 7 "tank," but also for resurrecting up to 100 hit points! That's about 9 archers or 1 paladin :). And the cart is just a nice bonus. It's always good when archers don't run out of ammunition. But as far as I remember, didn't they remove ammunition in "Heroes of Might and Magic VI" as well?