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I think thorn do this the same as many uk frame builders did before the mudguard breakaway clips etc existed.
With eyes at fork ends , if something gets caught in guard, the mudguard is forced into the wheel and can cause catastrophic results. With eyes higher up , the arc of movement moves the mudguard away from wheel so a bit less likely to be as catastrophic. Not as aesthetic but….
Very neat! I use those PDW axle adapters on my Thorn which has the bosses for the front guard half way down the fork leg instead of at the dropouts. It’s a bit weird and I’m never sure why some forks have the bosses up so high.