We should still build libraries for a few reasons:
1 - Education = no more free research. It comes quicker in emperor. So, we also need to be prepared for an unexpected research of it by the AI. (i.e., we don't know when they'll research it)
2 - Once we do get to Education, we'll need to build universities, and we'll need to build libraries first.
3 - It gives us more culture, which we NEED to claim land.
4 - We can't survive on empty forever. Not when we only have 5 cities, plus some. Remember, this is a FIVE CITY CHALLENGE (and then some). That means we don't have the luxury of 100 cities with 200-300 scientists producing 600-900 beakers per turn.
1 - Education = no more free research. It comes quicker in emperor. So, we also need to be prepared for an unexpected research of it by the AI. (i.e., we don't know when they'll research it)
2 - Once we do get to Education, we'll need to build universities, and we'll need to build libraries first.
3 - It gives us more culture, which we NEED to claim land.
4 - We can't survive on empty forever. Not when we only have 5 cities, plus some. Remember, this is a FIVE CITY CHALLENGE (and then some). That means we don't have the luxury of 100 cities with 200-300 scientists producing 600-900 beakers per turn.