They've two abilities to cut their enmity in half. Its easy to teach a new player to not pull aggro in order to survive but it's harder to teach them how providing others TP and MP is important. SE did a great job merging those things and Diversion would not only be unecessary but break this small detail of the role skills.

As said before in this thread, yes the main reason for the skills are to provide resources, but doing so you're dealing with your threat at the same time. A player that don't understand the resource management of others will provide it to them by caring about theit enmity. So the way those two skills are is entirely fine.