This is brought up every 4-5 months.There's a group who want to change it (usually by adding more/earlier faith as you suggest) because they struggle to found with it and there's another group that thinks it's fine as is. Crazy G can probably cut and paste his reply from the last time; he sums up the strengths quite nicely. The big one that I think always gets overlooked is your capital can build most of the fishing boats for your secondary tiles. If you have to settle the opposite coast you can buy a fishing boat or two to jump start your secondary fishing boat factory. Your secondary cities will start with 3 food and one or two excellent tiles to work. You sacrifice building some useful early buildings but most of the time you go GotS it's due to a sea based monopoly resource, so you're gaining science, faith, culture, and/or production on each fishing boat. I think the folk who struggle with GotS do so because they try to use their standard opening with GotS squeezed in. GotS changes my opening; I spam settlers and fishing boats with just enough military to protect myself. This gives my proto-empire a very strong base and I can then quickly catch up on all the things I delayed, whether buildings for a strong infrastructure or military for a conquering spree.