I mean, that's just because water is a simple medium we can just literally trow out in the environment after use, using basically anything else to spin said tur

I mean, that's just because water is a simple medium we can just literally trow out in the environment after use, using basically anything else to spin said turbines would require a closed system and cooling. Gravity batteries could be a thing but pumped water is the best version of that system, in this case we don't boil the water tho