I would cut them slack now because there's such a limited number of girls now that they have to keep collection restricted, because if everyone got them all, 1) they'd lose their specialness, and 2) there would be a swelling cacophony of players demanding more content, now!

Also, there's no actual gameplay, therefore no actual challenges to reward players with prizes to motivate them to achieve them. It's all persistence in the face of randomness, which is no substitute for gameplay.