I think your characterization of the micro vs. macro argument is flawed. It's not as much a question of whether or not a certain change is possible, whether that change is distance or genetic complexity, but a question of pace.
Nobody has any good idea of how fast genetic complexity can appear, or at least we have no idea of how quickly speciation can occur. It's more appropriate to compare the argument to, "People can walk 5 kilometers in an hour, but walking 10 kilometers in an hour is impossible!"
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I think your characterization of the micro vs. macro argument is flawed. It's not as much a question of whether or not a certain change is possible, whether that change is distance or genetic complexity, but a question of pace. Nobody has any good idea of how fast genetic complexity can appear, or at least we have no idea of how quickly speciation can occur. It's more appropriate to compare the argument to, "People can walk 5 kilometers in an hour, but walking 10 kilometers in an hour is impossible!"