I cannot quantify convenience for you, I don't have a 1000 people of various age, gender and eye-conditions at hand Some people have better vision than others, true. I'm not at all convinced, however, that there is a sufficient (%) amount of people out there who would appreciate (=see) the difference in higher resolution for this particular use-case, considering the extra engineering and cost involved.
Also, I'm not kidding about the danger of prolonged short-focusing on your eye (which is a result of holding the device closer to your eyes so you can make out the small but high-res letters). DO ask an ophthalmologist.