Then the fault lies in poor project management. Set realistic goals an work to achieve them. If it means lowering the potential of Stellaris then fair enough, if it results in a playable game.
I don't really agree with that. I would prefer for PDX to pursue ambitious goals, even if takes them a long time and some birth pains to achieve them. After all, that's how the company grew. They went for complex, sprawling geopolitical simulators instead of contenting themselves with the tried-and-true 4X formula. I think they need to push the boundaries, it's kinda the whole reason to play their games.