While I can understand the disappointment, I'm both not surprised and not all that bothered. I got to know that they have rain working for all the circuits and we basically got a slightly unpolished preview of the Tokyo Expressway South Loops in the wet (which effectively takes away any surprise for the next track to get the full wet treatment, hence the removal I suppose), but I'm looking forward to being able to do this without having to go online to experience it.
I'm just more intrigued after that experience because it tells me the rain is way further along then I expected and its now just a matter of properly texturing the tracks and polishing them for release (because leaky tunnels don't look right).