All these extra methods of preserving water adds cost, to a technology where paid off plants are struggling. Let alone ruinously expensive new builds.
You just can't easily retrofit them onto an _existing_ power plant.
Pretty much all the new thermal power plants are (including biomass-burning plants), except in places where cool water is not scarce.
It's weird to glomp onto that idea, as if it's some kind of a fatal flaw of nuclear power.