Umm..look at the graph in aircraft operating temperature ranges. How often are 90% humidity and 100 degrees encountered? Arent most operations temperature limited at that range?
All that for a max of 1% deviation in thrust? What is the deviation in thrust for a dirty turbine?
Between 20 and 40 degrees, there is virtually no difference in density relating to humidity.
Run BCOP, tell me again how humidity affects performance.
Please keep this chart handy, for the next time you fly at 80 degrees.