Now onto another item. Under Techniques in Guildlines 5 it seems too difficult to justify interface improvements decreasing the impact of everything else. Consistency is less important than improved general accessibility and usability, but developers should make changes conservatively to the layout of user interface controls, the behavior of existing functionalities, and the default keyboard configuration. Basically the paragraph says be extremely careful with interface changes which could make always conservative developers reluctant to do much. To strike a balance between consistency and the need to be imaginative to create easy Accessibility is the goal.
Consistency is less important than improved general accessibility and usability.
Care must be taken because in a document like this because it difficult to predict what phrases will later be taken to be most significant. Moving to the Guildline itself 2 items could provide more information. They know enough to ensure that users can drive their interfaces from the keyboard, but they don't spend a minute thinking about whether the keystrokes make sense from a user perspective. Once the WG explains the needs via the Guildlines some of these bright newcomers will prove highly skilled in creating easy access for all. If they have enough information to guide them.