So....... I'm not trying to argue, I merely posted a statement if fact, then a picture of a chart from a text book that in titled Automotive Heating and Air Conditioning 7th edition. The author is James Haldeman. The book in question was published in 2014 I think, I would have to double check the exact print date in my specific book. It is part of a NATEF/ASE approved curriculum for automotive schools. The book is currently in its 9th edition so I am inclined to believe the facts as they are presented in the book. And furthermore humidity, although not a primary concern is something to keep in mind when addressing any ac system. For example if the op lives in Florida where it is humid and a guy from a dry climate tells him what his normal pressures are, there can be a large difference in the observed and target pressures. This is critical when trying to charge an ac system without having a scale. A proper charge is dependent on weight of refrigerant. The system will state x pounds of y refrigerant. When charging by gauge and pressure we are only getting in the ball park of a proper charge. Therefore accounting for high or low humidity is actually important. If you reference the above chart that I posted you will see at 90 degrees low humidity pressure will be 170-220 high humidity will be 210-290. So using our Florida example, if he lives in Florida and charges to the normal pressure for a dry climate he will I fact have a low charge in the system but his pressures will show "good". You admitted that humidity plays a role in the function of the evaporator, and it is nothing more than a heat exchanger. Well so is the condenser and its efficiency directly correlates with the high side pressures at the service port.
I also don't know why you are trying to marginalize the facts stated from a peer reviewed textbook. I work with ac systems on a daily basis in an environment that has large humidity swings within a work day. So I as well as my coworkers can attest to the fact that pressure readings vary through the day with our humidity swings (at the same temperature) and the importance of taking humidity into account when working on mobile ac systems. Can you get it to blow cool air just looking at temperature, sure. Is it operating at its peak performance, not likely. I like things to work as well as possible when I'm sitting in a greenhouse on top of a lot of heat from a transmission, but that's just me