Nope
They don`t need to. Look at the progression from 6.1 to 6.2. There was hardly any increase in rewards there. A couple more shards, a couple more t2a. But not much else.Eventhou the t3a and t5b are quite low compared to what was gotten in recent offers reward increase in story quest has always come from chapter 3 and especially from chapter 4. I think expectations were set quite too high by the players.