[aqueueaqueue]

Fitness function? What if end up walking down the eugenics path or genetic engineering.

[iinnPP]

Society took the biggest of bats and beat the ever loving love out of the fitness function in many parts of the world.

[TheOtherHobbes]

Fitness functions are retrospective, so there is no "We should have done this differently."

The definition of fitness is literally whatever persists by reproduction.

Features and species that persist for a while and then collapse/disappear are a normal part of the process.