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I always thought the angled interface was to help centre the part (wheel) where it needed to go. Cars/wheels with their interchangeability having a much broader tolerance than bike parts. Plus, you don't need to centre the pedal, the axle does that itself.
stevo_com-
thought the angled interface was to help centre the part
No, the rim has a centre bore and the hub has a matching shoulder to centre the rim on the hub. In modern manufacturing, the bolt circle is pretty accurately concentric with the centre bore, and the small amount of slack is taken up by having everything flex a bit, because the world is made of rubber.
gbj_tester
Why don’t pedals and cranks have an angled interface, like lug nuts on cars, instead of two flat surfaces?