Serious question, shouldn't 'double up' games (teams you play twice) be completely randomised for fairness?
I guess it’s how you define fairness? If a randomised draw gave 18th the top 6 as double ups and the 1st the bottom 6, would that be more or less fair? A team could make finals based on a too skewed set of doubles or miss for the opposite reason.
That said, no system that relies on 6 doubles will ever be fair no matter what they do. Teams fluctuate in ability too much to purely peg it to the previous years ladder, and there is too much variance in home vs away fixtures (plus many other things).
Also the doubles are often compromised further by the afl chasing as many marquee fixtures as possible.
In short, degrees of fairness with the afl fixture is like saying “being shot is better than drowning”. Either way you’re still dead!