Is it? Then why are flight sims so popular?
They don't really have difficulty settings and anyone with a full pilot licence should be utterly pwning all the other players...
Then there are the types of 'git gud' games, where there's always someone 'gudder' than you, so you have no hope of ever overcoming that challenge and might as well not bother playing...
RPGs are often pish-easy for anyone who can do a bit of maths, but that's not why they play those games.
Challenge is secondary, compared to entertaining you and being engaging enough to justify the purchase price. Some of my favourite games have been very unchallenging story-centric ones, to the point where the endless bullet-sponge combat gameplay (HALO, Mass Effect, Assassins Creed) was just guff getting in the way, and some were almost pure story (Cloudpunk).