To me, a big part of good game design is not being afraid to let your players feel frustrated, lost or hopeless at times. (gameological.com)
In the end this doesn't even need a difficulty setting, but rather just good game design. (visionriders.com)
What I hadn't appreciated until this conversation was just how strongly he believed that improvements in technology — and game - making tools — enabled better game design. (kotaku.com)