I understand your point but it bears further scrutiny. Yes he was human, but he was also super human. Who else do you know that was born with God already in his heart. How many people do you know that walked on water, raised the dead to life, fed multitudes with a few loaves and fishes, and so on? He was not mortal. He was perfect and sinless. Death comes only by sin. He had no sin, therefore the only way he could die was by accepting our sins upon himself. We all die because we are born sinners, he was not.
To say the incarnation would be a sham if he could not, and if I understand you, did not suffer afflictions before the cross, misunderstands our justification. He had to be a perfect sacrifice, to be the second Adam as Paul tells us in Romans 5. As a second Adam does not mean just another man like fallen Adam, but a perfect second Adam as Adam was perfect before his fall. God did not justify Adam. Jesus justified Adam in that he was exactly like Adam in his perfection with the exception of having the eternal Spirit of God in him at birth. This is why Jesus cried, My God, My God why have you forsaken me? on the cross. It was not possible for Jesus to become sin while the eternal Spirit remained in him. God had to leave so Jesus could become sin. Then with sin, Jesus could die.