Insulin response is a varied factor. Yes simple carbs when eaten alone can cause a greater insulin spike than complex carbs.Remember complex carbs also raise insulin .See studies. But what about when taken in a combination,in the form of fats,protein and carbs together.That has a significant impact on the GI and insulin. GI is a marketing term used to sell crap supplements.GI initially was taken for individual foods.
This has no place in real life as people wont eat sugar on a day to day or meal to meal basis on its own.
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Thank you for your comment @sh6690 and your input. I completely agree with what you say. Food combination is what makes a diet balanced. Nowadays a lot of people do put a lot of high GI food together, just looking at the fries/burger combo, so just getting a basic awareness of what carbs are and the difference between simple and complex carbs is already a way towards healthier eating habits for a lot of people. :)