Just to make this is clear for everyone. The
we produce each turn only gets
committed towards a tech when end turn is pressed.
For example last turn we were 1 turn from pottery. In the tech part the dark green bit is what
will be spent towards out tech choice when end turn is pressed.
So if we had changed our tech before ending turn we would not have pottery.
Once I pressed end turn, we immediately get pottery and our score goes up. I then get a prompt for what tech to research next, and I chose Writing. But the
will not be allocated for next turn towards this until end turn is press
next turn. So if I change the research to something else before pressing end turn then that tech, and not writing, will get the bulbs.
So the green bar on writing will not be spent until we end turn:
Keeping writing to our choice, and then switiching to mysticism, ending turn, and switching back to writing, has the advantage of hiding the fact that we are researching mysticism from demographic analysts like oyzar.
The turn player just needs to remember to change techs at the right time. If it's me doing the turn you can guarantee this will be remembered...
p.s. The 2 turns on writing were spent before we started on Pottery, remember? It's not been spent instead of a turn on mysticism, we can still get mysticism in 3 turns.