low user effort (i.e., that the required user action is quick and easy)
I have my questions about this low user effort: to what level? Is it effort an attribute of the product? Let's take for example a video game, if it is too easy people will soon lose interest, get bored, if is too hard, people are going to feel frustrated and give up on the game. Also, are talking about cognitive demand (stress, attention, logical thought) or human resources (visual, auditory, tactile). There is a need to expand this criteria in terms of what is required from the user.