We're talking about two different things. I was not talking about clouds, and yes, they are an uncertainty factor. The positive water vapor feedback is simply that relative humidity will increase in a warmer climate. That's the main thing that they do in GCMs, and that's the main thing that's the topic when H20 as a greenhouse gas is being discussed.
Since you work with this every day, what impact did Minschwaner and Dessler's paper have on your work?
I'm sorry but you need to do a little more reading.
(1) Clouds are a KEY part of the water vapor cycle. That would be like leaving predators out of the food chain.
(2) Absolute humidity (not relative, which is temperature-weighted) increases in such places where moisture and heat are both abundant (tropics, for example).
This is my daily work and has been since the late 60's when we opened the WeatherLab at Panama City (FL). We study climate mechanisms first-hand and combine that with parallel studies of the Gulf of Mexico and the air-sea interactions that have a major affect on weather.
You are coming up with what looks like random stuff pulled out of scattered and dubious sources.
Please tell me what climate research you have done this week, month, year.....lifetime. I'm doing it today, as I have for the past 30-something years.