After unlocking a new policy you can change your policies for free, and you can make multiple changes in the same turn. This means you can check the effect of your new policies and switch them back if they don't seem worth:
Edit: also, future civic and tech are not repeatable so if you have excess culture/science it just goes to waste!
Edit 2: turns out future techs are repeatable, thanks Sarah for clearing that up
Edit: also, future civic and tech are not repeatable so if you have excess culture/science it just goes to waste!
Edit 2: turns out future techs are repeatable, thanks Sarah for clearing that up
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