It's simple: Job duties are supposed to be, at least ostensibly, exams meant to gauge your understanding of your job up to that point, and how to play it against a set of typically basic mechanics.

However, the Echo effect allows players to brute force their way through these duties without care or understanding. Many players have clearly learned nothing, and have been rewarded fr failure by being allowed progression anyway. Removing the Echo effect and forcing players to understand these duties is a good step toward creating a higher class of community.

And what about those players who don't finish their job duties and continue to level and queue in duty finder? If they encounter resistance from other players by not having necessary abilities, they'll simply have to learn to understand their jobs and make greater efforts.