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lesterama
Yes, I'm sure you're correct, the axle should not 'creep forward' and even if it did it would not move evenly, but jam as mentioned above.
On your second point, I think there's something in what you say. Nowadays very few people actually ride their bikes to races and, as you say, we have multiple bikes.
However, track ends must give more scope for chain adjustment, so you can have a bigger difference between the sprockets on a double sided hub, which might be useful to an ambitious time triallist riding out to a flat course suitable for a big gear. Is there anyone who would still do that?