SAFe, referencing Daniel Pink's "Drive," identifies that making a contribution (B) and autonomy (E) are major factors in unlocking intrinsic motivation for knowledge workers. External motivators (like incentives, rankings, or strict MBOs) are less effective for knowledge work.
"Knowledge workers are most motivated by autonomy, purpose (making a contribution), and mastery, rather than extrinsic rewards." (Source: SAFe 6.0 Framework: Principle #8 - Unlock the intrinsic motivation of knowledge workers.)