None of these features are necessary to build a production-ready Rails site. Before Rails 3, people built and deployed production-ready Rails sites. Production

None of these features are necessary to build a production-ready Rails site. Before Rails 3, people built and deployed production-ready Rails sites. Production asset optimization was left up to the developers to figure out. Rails 3 makes asset optimization very easy by comparison to what needed to be done before. Rails has not become more complicated to develop for. Rails 3 just has more features than it used to have. If you want to use more features, the features are there for you. If not, you can ignore them.