Comment by kqr
Your examples are about making circumstances equivalent, thus canceling out any advantage. There's no way to e.g. switch lanes in swimming so we're bound to have some contestants advantaged.
In cases where some contestants have to be advantaged, the conventional solution in sports is to advantage the ones who performed better according to some metric.
I think it's unfair to reward those who were lucky or already advantaged somehow, but my wife who has a background in track and field thinks anything else would be unfair.
I believe the main reasoning why this is fair is that this advantage is earned.
Would it be fairer to use randomly assigned lane? Then you get almost equal competitors in advantageous and disadvantageous lanes?
Isn't the top result in a year also used for qualification purposes (and thus lane assignment) for top-level competitions? Basically, you earn a spot in the best lane throughout the calendar year.