I have to say, the falsetto thing in that song at some point sounds like he's being tortured (sorry for being so cruel, I had to compare it to something), there is this dramatic effect, when you listen to it, but at the same time it's just too much, it starts to get really painful, at least for my ears. Maybe it is ment to sound sad, it's like crying of a suffering person who is lacking love, or something. I agree, it's very moving, I feel touched when I listen to it, but I can't actually understand at some point what he's singing, I agree with you here. He probably should do something with that matter unless he wanted it to sound like this. Maybe that was his intention, I respect his decissions, he's a wise man. The thing is, that 'Rain' makes me very thoughtful and I can't really say if it's bad that it sounds a bit like dirge.
In fact, this song makes me feel in very contradictory ways, if you know what I mean... I think that is the fact, that makes 'rain' beautiful in my ears. And now I confused myself. I first said it's painful and then it's beautiful. Maybe that's the point.