Constitution and Biology do help the SE quite a great deal (Communism is pretty much neutral to both SE and CE, IMO). However, I agree with what futurehermit says about CE civics and techs. Printing Press, Free Speech, US, Emancipation - all these help a CE, versus only two helping an SE. Emancipation is often not something you can ignore, and if you don't have cottages to grow, you don't benefit from half the effects of the civic. And if you're not already dominating the world or at least your continent, Free Speech would also be good to help push back the borders neighbouring civs, who might be adopting it and pushing back yours instead if you don't. Moreover, as futurehermit has also pointed out, the increasing cost of techs make lightbulbing very weak. You can't research Physics fully with two GSs on Normal speed. If you're going to count on the by now slow trickle of GPs to help you research, you won't get far.