I haven't had a chance to listen to it, but it's a pod cast
http://fronttowardsgamer.com/2010/1...o-episode-28-dennis-shirk-for-civilization-5/
and an excerpt that CPA is referring to on civfantic's front page:
"Shirk mentioned how Civ 4 with BtS was considered to be near "perfect balance" by hardcore fans. Making Civ 5, they knew that making a better balanced game would be--"How do you make something over Beyond the Sword?" So they decided to change game concepts and such.
And yes, as BtS pleased the hardcore fans, they decided to make 5 appeal more to those who might have loved Rev and wanted something more--but who may not be ready to leap into Civ 4's complexity.
Social Policies were made permanent because Shafer wanted people to develop a system over time that would be meaningful and not simply switched around. Shafer would be able to answer more fully the question why Social Policies are permanent, Shirk emphasized--but historically the idea is that you put "ideas into your people"--Americans who are democratic would be hard pressed to suddenly switch to Communism, is the *imo pretty good* example Shirk gave.
"Balance is ongoing"--esp. with the Civ series. To quote, Shirk said the testing team was a "fraction of a fraction of a percent of the total number of users" and that therefore future feedback and current feedback will play a part in later balance patches etc.
"We love the people who make enormous complex mods"--Shirk mentioned he knew forumers would include people who analyze, down to tiles and such--who would deliver constructive criticism--and really angry forumers, and people who were ecstatic--and people somewhere in the middle."