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….
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….