The audience interest should be on the characters and it is the task that must be worked with more preparation. Backgrounds can be developed in parallel and in the final stage of the production. A rough background is enough to place the character animation. Also, usually, backgrounds are mostly static so they require less work.
It is just a question of apply the resources where it is more important, I think.
needs your help!
Developers, packagers, bug testers, translators, artists, web developers, wiki writers... you can