Indeed, you cannot roast a turkey by simply turning the oven on 120 and pumping in a lot of humidity since the turkey is not trying to cool itself anymore. Any discomfort measured on the turkey’s behalf would certainly be matched by the human since the bird would remain very much uncooked. The issue is that this model doesn’t presume the possibility of 120F and 95% humidity. Often, in situations where the temperature is able to reach that level, such as a desert, then the relative humidity is correspondingly low. This idea of using a model to predict extreme values beyond the measured data is called extrapolation and should be utilized with care. Interpolation to estimate values within the confines of the measured data is however generally a safe bet.