In 7 Wonders, can you make an informed decision on which resources to draft?
The last pages in the rulebook have a tree showing all the structures, what they cost, when they become available, and which structures allow them to be built for free. I'm not aware of something similar for the expansions though.

That being said, if you're constantly analyzing all the cards that might become available in the future before making a pick, you're not going to be very popular with your group...