Then they label the intended difficulty with “recommended” and say that will give the best experience and that if you choose a difficulty higher or lower you might impede the intention of it.

You’re missing the point, which is weird because I explicitly stated it. To repeat, an artist might not want to create an inferior version of their art, irrespective of the utility of doing so. Art is an egotistical affair.

I really don’t see the problem with having options.

Options can make sense in some games but not in others; a developer deciding not to include them has likely either figured they wouldn’t work with the game’s structure, wouldn’t be a good use of their time or both. Difficulty options are simply not a one size fits all solution, for the same reason it wouldn’t make sense to demand all painters make colorblind-friendly versions of their paintings.