Nothing is worse than ridiculous arguments “for our side”.
It is not so much a lack of complexity of the models attempting to predict future climate as it is a lack of sophistication and proper assessment of relative factors. The two are not the same thing. And some models do attempt to account for water vapor. Correctly? - well that IS an issue. But a blanket statement water vapor is ignored is, well, ridiculous.
Worse is the CO2 and breathing argument. Humans naturally produce poop and urine, too, as a part of living. Are you going to argue those waste products (CO2 is technically a human waste product too) if dumped by a city as raw sewage into the environment are not pollution?
I had read most warming models do not include water vapor. Water vapor is just one possible factor. I have not conducted detailed reviews of each so thanks for pointing it out. There are other possible factors as well. I believe the climate is too complex to model. In addition, toss in manipulating data and having models fail with additional data and you have a worthless exercise.
Poop can be valuable as fertilizer. Is water pollution? Is air? If you fill up the room you are in with water ,you will die. If you inject air into your bloodstream, you will die. The portion, (and/or location) is the poison.
Older CMIP5 and earlier models only account for a fraction of the energy the Sun puts out, only the light, not massive amounts of charged and neutral particles, and poorly on ionizing radiation.
Worse, these models grossly over estimate the CO2 contribution, and do NOT accurately model existing historical data.
CMIP6 is a much better balance of the climate forcing factors, but still isn't being used in many recent papers.
Since papers using the more accurate CMIP6 model don't give scary headlines (and don't blame modern civilization), they are under reported in the popular press...