It's also almost never 100% true. Even if the glasses are perfect, they also have to be perfectly clean or you get a bit of a blur anyway. Small enough to not be noticeable, but strong enough to blur the benefits of such a higher resolution.

Actually, no. There is no available correction that would allow me to read the smallest letters on the optician's test board. Age, floaters, coming presbyopia combining with aggravating myopia, uncorrectable changing astigmatism, etc. You're probably too young to understand :)