Reynard
aka Ian Eller
People should set DCs correctly. Of course, 5E gives next to no actual advice on how to do that, so...Personally, I haven't found that to be the case. It may happen less often than high level 3rd Edition, but it's not very difficult to make the d20 roll largely irrelevant in 5e. There are things that I believe 5E does very well. And, while I do think there have been improvements made by 5E over some aspects of some older editions, it would not be my opinion that 5E has "solved" the issue.
I have been involved in AL games in which a combination of easily accessible abilities made it so that characters did not even need to roll a d20. Their minimum roll was 9-10 and they added enough through expertise and other abilities that there's literally not a way to fail. While there may be some Munchkin-ism going on there, achieving that was neither difficult nor did it involve obscure rules that were hard to find.