I read your post which did not ask a specific question. You just complained about the heat issue. You then ended by saying how disappointed your were. Nowhere did you specifically ask about design concerns, mention a KB article (even now without a citation to the article,) or ask if there was a way to cool the computer. In fact there isn't a single question in your original post.
Since heat in Mac laptops has been discussed ad nauseum since 2006 there are hundreds or thousands of posts about the subject including many discussions of the cooling design. If you didn't find these then you didn't look very hard or very long. True there may not be specific posts about the Late 3008 models the general topic has been around for two plus years. I should know since i've participated in many of the topics.
And, no, every submission isn't a complaint. There's a difference. If you're not sure about this then you need to read the Discussion's Terms of Use by clicking on the link in the right sidebar of this page.
Apple does not release information on their technical engineering designs for obvious reasons. But the engineers have been designing laptops for some time, so it's reasonable to assume they know something about cooling design. The CPUs and GPUs used generate an enormous amount of heat in a relatively small space. The chassis is part of the overall cooling system. Expect it to get hot. This warning appears on Page 68 of your user guide:
Proper handling Set up your MacBook on a stable work surface that allows for adequate air circulation under and around the computer. Do not operate your MacBook on a pillow or other soft material, as the material can block the airflow vents. Never place anything over the keyboard when operating your MacBook. Never push objects into the ventilation openings.
The bottom of your MacBook may become very warm during normal use. If your MacBook is on your lap and gets uncomfortably warm, remove it from your lap and place it on a stable work surface.