Put another way, the human brain is not designed to enjoy monotonous repetitive tasks that take no skill (so the average person would enjoy a repetitive activity like knitting which takes coordination and thus uses your brain, but not hitting the same button over and over and over and over and over again).Thats why all modern educational science points to interactivity as the best way to educate someone and not making them mindlessly solve problems on a sheet.

ok so why are mario and zelda still going strong? Or platformers in general... see little big planat. You spaming the jump button....
Name a game that actually really relies on skill. I have yet played a game that did.