Both of those had good reasons, as both were made of a "why should I trust you?" thing. The CoH didn't want to send some idiot to certain death. The Ala Mhigo have no reason to trust anyone but themselves after how they were treated when the fled the Garlians.
Would you rather it go like this?:
"Why should I trust you?"
"I'm an adventurer."
"Okay I trust you fully."
The other thing the missions did for you was guide you along one path of leveling you could do.