About the lightbulbing vs settling issue, I have a clear opinion. The problem is that I share it with myself only

.
up to prince : settle
monarch and over : lightbulb
Why? because of the liberalism race and to a lesser degree for the trading opportunities (or lack of).
If you want to have a shot at the liberalism race at immortal level, it takes lightbulbing of at least philo and part of education. Ideally, you will lightbulb philo, paper, edu twice and liberalism. You can make it with just philo and edu twice without too much problem = an academy somewhere is possible.
OTOH, at chieftain level, you won't be able to trade for anything if you lightbulb your way to liberalism. Lightbulbing may still be an option for a super fast diplomacy victory (check the HoF gauntlets for BC diplo wins

), or if you're playing for a super early conquest or domination win. But you won't rely on trades to get more value from a scientist, so the beakers count is more on the academy or settling side even if you're playing a fast game.