Earlier quoted context omitted.
The FCC originally didn't want to include fixed wireless or satellite internet for RDOF consideration, so from that fact alone I believe they were intending it to be fiber optic. A fiber plant is pretty immutable, even if you end up upgrading the things connected to the fiber for higher speeds. Once it's buried, it's pretty reliable (unless a passing herd of excavators get hungry and smell the fiber buried undergroun…
Buried fiber is never going to happen for the rural folks serviced by Starlink. It's hard to get companies to put fiber down in well populated suburbs, getting them out into the country is pure wishful thinking, especially if you're only talking about a billion dollars.
It seems weird to me that we can run Cable TV to fairly remote locations but not fiber.