> readers not understand that someday they will grow old, and their eyesight will fail, and they will find themselves increasing the font size on their devices?

let's reverse that, did you as a youth give much thought to what the olds went through on a daily? obviously, depending on age, the olds might not have been using computers to the extent we are today, but it still holds. the hubris of youth is part of growing up. until you personally experience something, it is hard to fully grok it. sure, we can know somethings without experience like not drinking bleach is a good idea. there are other things that are just so outside of the normal experience, it is hard to fathom. for a lighter example, have you ever tried walking in a pair of high heels even if not stilettos? it's painful, and i was on platform heels. i would fall down in 3 seconds flat with stilettos. after several hours, i was complaining about my feet hurting in the shoes. so after walking a mile in another person's shoes, I will never be frustrated if someone in my group needs a break from their shoes during a long night out ever again.