I hope that this is bad wording, because long-term planning is extremely important.pre-plan less before (and during) the game. Make decisions based on the situation now.
What really is a very common mistake is to understand yield inflation. 4 culture per turn now is more valuable than 100 culture per turn on turn 200. God-King is the best pantheon in terms of yield that it will eventually give you, but i never ever pick it because of how late those yield come.