There are some games that have less cheaters because the cheaters are handled more frequently or are dealt with more effectively.
While your perspective may work for you, it doesn’t work for the competitive D3 gamers.
We don’t get to compete at Blizzcon, online tournaments etc.
All we get is the leaderboards. The players on the front page (top12) would be equivalent to the finalists of a tournament, and that is everything!
Having the boards clean and legitimate should be expected and a standard in any game.