DANGER. OPINIONS AHEAD.
The game has bucketloads of content, absolute tonnes of it. And the Devs are proving they can add more and add it well. So motivation? That's not on them, short of them managing to multiply their team tenfold and maintain quality at the same time. So that's in the "more to do" bracket.
End game content? Yes, the game does need more of that, but frankly the Devs are currently smart enough to avoid it because if it isn't backed up with content across the board then it's just another bottleneck and you're in the same spot. The original devs constantly fell down on this.
I'll give you an example of what I mean, YMMV on whether I'm hitting the mark or swinging wild here though.
The war with Praetoria. There's Portal Corp missions and on up to iTrials, but in a war with another dimension where were the missions for everyone? Where were the level 20 missions (red or blue) where you had to infiltrate a base to do a thing so that the 50s could even DO an iTrial? Too much hand waving and relying on Dream Doctor (please someone remove him from all future content!) and he's a deus ex machina that removes player agency. Bad choice.
So, HC are taking things slow but in the right way (sure, there's things I want them to do that they haven't and might not but you can't have everything).