Of course, it's worth pointing out that The Final Reflection
was presented as a work of historical fiction even within
the Trek universe. Although, granted, one would think that its author would've at least striven to get the broad strokes of history and sociology right.
But it's definitely wrong to equate Ford's fusions (wasn't that a make of car?) with the QuchHa'
. Yes, they have one
thing in common -- explaining the smooth foreheads via an infusion of human DNA -- but the important stuff, the history of how and why it happened and its meaning and impact within Klingon society, is all completely different. "Fusion" is a term that has a specific cultural, historic, and functional significance within Ford's Klingon society, and you can't divorce the label from that broader context and pretend it's only about the genetics.