Well, I think we've already established that I have a different view of what constitutes healthy humanity than you and Adami. The Kirk era comes a lot closer, in my book. I maintain that the Picard era humans are lifeless avatars. We won't agree on which is better, so we'll just go on preferring different depictions.
As for Landru, Kirk made the more convincing argument. I agree that there was no proof that creativity was vital to the continuation of the body, but I'm not sure that matters. For one thing proof isn't always present, and you can still win an argument by making the better case. Another consideration is that perhaps Landru already recognized that creativity was necessary, but hadn't been factoring it in all of these years. As was pointed out, it had the original Landru's intellect and ideas, but couldn't gain his wisdom. The necessity of creativity might have just been something it knew innately, but hadn't come to realize yet.
Don't recall which episode it was, although it was recent, but Data told troi that she made a foolish move. She smugly said "you just wait and see," and made a move that surprised Data, who told her that she'd win in x number of moves. Then they all got called to the bridge for some pointless love fest or something.