There is no reality I am willing to build a stone tower currently with them costing 10 steel bars. I am not spending two bars shy of a B12 on village infrastructure when I can just spam great halls or stone mansions to accomplish my intended goal instead.
I think as it stands you will only see towers in hard-larp villages or very deep-world where there are copious amounts of bad steel floating around, especially in conjunction with the fact that making steel pre-L5/L6 is pretty cringe.
Please consider making towers accessible for normal human beings again by either reverting the steel in their recipe or making it a more reasonable quantity, maybe two steel bars if you're insisting on the progression gate.