Better details and fluff directly pertaining to your current mission.
Except that's not what they're doing. They're taking out all the "details and fluff", so that instead of "take this thing to here, because reasons", it is just "take this here".
A while back, they made some 20 new 'storyline' missions, which were mostly courier missions, which included a lot of world information. Cargoes were of various types, things like hybrid slaver hounds, and the mission briefing talked about why those were important. That sort of thing is completely opposite to what this dev blog is suggesting.
Courier missions as just "take this there". Well, that sure is interesting and provides content to rp about.