Worth mentioning that you don't start a game thinking what policy you will do.
I do exactly that in every game that I play. I know my ancient era tree ahead of time, and more than likely have decided on my renaissance and industrial trees as well. Maybe even ideology. I've probably decided ahead of time what I'm generally doing with religion, how much I'll try to conquer, what wonders I'll aim for, and what victory condition I'm going for. I'll admit that it might not be the best way to win every game but I find more pleasure in trying specific strategies and trying to make them work.
Having said that, if I'm planning to go tradition and my starting location sucks for food I might consider a restart. If I find that my neighbors are Aztec, Songhai, and Zulu I'm still going tradition and if I die trying, oh well. Tradition at least has the benefit of not needing much room to settle so even against aggressive neighbors you can potentially turtle behind some good terrain and citadels.