If the original lube that comes on new chains is so good, why don't we all just have a unified perfect chain lube? See the following link to read about peoples opinions about new chain wax/lube (and when to remove it): New chain is pre-lubricated, should I clean it before use? Can we buy this chain wax/lube that Sheldon Brown(see Carson Reinke's comment in link above for quote) says we should not be removing from our new chains? Is there a perfect lube? I do realize there are different lubes for different weather conditions and environments.

You can see the accepted answer in the question you've linked to mentions that the chains are waxed. It is quite possible to use wax on your chains yourself and some people do. However, it is a more involved and time consuming process than the typical process of using chain lube.