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The initial design – which was advertised as the Diadrant fork in Cycling of December 1935 – was in fact quite different to the type we know now and was changed apparently because the early prototype fell foul of existing patents held by Dunelt.
They wanted a unique look
This was a vital point for marketing in an age where brand advertising on racing cyclists’ clothing was banned by the organising body.
For this reason
Same as any marketing, they’ll tell you why it’s better like the l shaped cranks…
Not/random-user
Diadrant forks and the "vibrant" rear triangle were meant to confer a mechanical advantage too :)
https://www.classiclightweights.co.uk/classic_builders/bates-cycles/bates-cycles-3-diadrant-forks/