so people with poor manual dexterity, vision issues, poor grip should pay for their own skin grafts (which virtually no one in the u.s. could afford to do) if they are truly injured by coffee that is hotter than many coffee machines will keep it at all? which is, of course, something that they wouldn't expect. most restaurants don't keep their coffee that hot because they want their customers to be able to drink it without blisters. mcdonalds, in fact, now keeps it cooler and it's still plenty hot, not merely warm.
Plenty of restaurants keep their coffee at the same or even higher temperature. Feel free to read about it here:
Liebeck v. McDonald's Restaurants - Wikipedia
People with issues listed by you should be extremely careful when handling *anything*, let alone hot coffee. But this is a subject for a different conversation.
It's also unclear - at best - whether McDonald's ever actually lowered the required temperatures for coffee sold in their restaurants.
there is no reason to keep coffee that hot. there is no reason anyone with experiences with coffee makers at home, the office or doctor's office or coffee from other restaurants would expect it to be that hot.
There are some opposing arguments coming from various sides, that can be found in the same article that I linked to.
I learned that coffee was dangerously hot when I was two years old, without getting burned. If I ever get to the point that I can't remember basic stuff like that, I hope that my kids and grandkids will have enough common sense to put me down in a painless manner.
Obviously, YMMV.