I think one of the problems with "Destiny" here is that it is also confused with preordination. Preordination is a path that is impossible to refuse, where Destiny implies individual choice. In "The Eternal Tide" there was a lot of choosing by a lot of characters.
Science Fiction in the past has chosen to ignore the metaphysical, yet is such a part of human experience; I don't believe it will be left behind when we step away from Earth.
“It’s not that there is no such thing as ‘Destiny’—it’s that ‘Destiny’ is far more complex than the Ancient Greeks knew.” Jacqueline Lichtenberg