Water is “absolutely clean”
Wrong. Water from the earth contains huge amounts of highly corrosive dissolved salts and minerals. Dealing with the concentrated brines is a challenge. It’s not insurmountable, but a serious problem (lots of geothermal plants are running around the world).
Very true...but surmountable by extracting only the heat with an enclosed recirculated "refrigerant" (working fluid).
I still prefer nukes. Small modular nukes, which the US has been building and using successfully since the "Nautilus" was launched back in the 1950's. It is the great behemoth installations that have given the problems.
Lol, I should have known that others here on FR would be in the know.
Sounds as though you are familiar with the same sites in the USA that I have visited.
30+ miles of pipe is expensive, especially when it’s above ground and insulated.