I usually go for the fastest available techs but I could see how the number of choices can cause player fatigue, especially once you hit the second ring without a specific victory focus in mind. In Civ 5, one usually had to research most if not all techs to achieve most of the victory conditions. In BE, on a bad day I think it could be overwhelming. But the affinity focus in teching helps especially in figuring out how to upgrade your units.