Correct term for realistic user behaviour and decision making
Science in general refers to ecological validity as the degree to which materials and settings in a study approximate the real world that is being examined.

Therefore, such limitations could be referred to as limitations to ecological validity. Often, such limitations are inherent to running an experimental study, as opposed to studying the real world. Whether or not this is a risk to the overall validity of your study depends on what conclusions you intend to draw from the results.