If it was less/if they leveled together people would complain it was too fast and that there was no real reason to run them anymore since they are slower than actual players.
I posted this in another thread about Trusts but I'm going to say it again: Trust leveling is end game side content that is supposed to take time to do. Its is SUPPOSED to be a grind. Shared FATEs were supposed to be a grind but people got to Rank 2 within the first week of the Expansion and complaining there is not a whole lot for them to do now. Because people do things quickly and complain it's done. But when it takes time they complain it takes to long. SE pls.