I think this isn't fair to Rawls. If you had to design the internet today, you would probably design the internet just as it is today. Not because you want to

I think this isn't fair to Rawls. If you had to design the internet today, you would probably design the internet just as it is today. Not because you want to exclude 'people that are 80 and have really bad vision', but because even if you made every page have high contrast and an 60pt font, there are almost no 80 year olds on the internet compared to 20 year olds, and you have to cater to your actual audience, not your 'in some universe where old people were on the internet what would be the best way to make it easy for them' universe. This isn't really so crazy, and it's not some kind of ableist ageist blind spot that content creators have. There is no demand for 60pt fonts, the people that need them, who are extremely few, are more able to adapt the world to their needs than the world is able to adapt itself. Or maybe their needs are totally missed, but you can say that about literally any tiny group.