My main criticism with pointing based on complexity is that people don't think in complexity, they think in time. For example, a 1 point ticket might be to move

My main criticism with pointing based on complexity is that people don't think in complexity, they think in time. For example, a 1 point ticket might be to move a 50lb weight up a flight of stairs. A 5 point ticket might be to move a 500lb up a flight of stairs. If you plan a sprint with 2 developers taking 5 points each, one with 5 of the 1 point tickets described above, and the other with a single 5 point ticket described above, you lose the complexity dimension. 5 points vs 5 points looks like apples to apples, but it is really 5 apples vs 5 oranges.