> If you plot the blood sugar concentration of the person consuming a solid piece of fruit you see a nice curve where the levels rise, peak, and non-violently fall.

There's nothing wrong with this except that it probably makes you feel more hungry and eat more. But the blood sugar surge isn't really unhealthy in normal people, it's usually the subsequent behavioral impact (the low that makes you feel hungry) that causes the real harm (ie: the total sugar matters more directly than the glycemic index).