I think the main draw is its elegance. You have very efficient power from the sun, put that directly into your compute, radiate it out. Energy is ~free, no heavy infrastructure required, just a closed circuit for computing.

Elegance compared to a PV/Storage facility built next door to a data centre?

It doesn't make sense right now, and won't for at least 5-10 years.

By which time, this current round of hype will have burned up ~$1T if it doesn't fall apart from the current internal contradictions and lack of market/customers/uses.

We're still on the uphill ride of the Gartner hype cycle, not even at the "Peak of Inflated Expectations" yet.

We also have very efficient power from the sun here on earth. I don't get how that is an argument.