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@forms
Well actually yes. Both reasons are quite specific to fixed.
Flex is less so, though pulling away from the lights on a higher gear than you would on a road bike for example, you notice the flex. Also, slowing under speed, or simply putting the power down.
Cranks bolts loosening, although perhaps not entirely relevant to fixed, I think that the added strain fixed cranks get put under (from skidding, and the above points) helps the loosening considerably. And the creaking is a lot more noticeable when riding fixed, again due to added strain on the cranks.