Why are you conflating "best" with "what you would recommend a friend"?
Many of the best things in life are hard. And you wouldn't necessarily recommend them to a friend.
When you consider specific domains, often the best instances of X tend to be harder versions of X. Or, when people become familiar with many instances of X they seek out the "best" instances of X. Its natural that those best instances would be difficult for people unfamiliar with the domain.
>Or, when people become familiar with many instances of X they seek out the "best" instances of X
I think you're saying the same thing as the GP? Ulysses is a book for lit nerds, which I suppose the Modern Library board were.
Looking at the list, there's hardly any books from after mid 20th century. That makes me think that the board comprised primarily old lit nerds, who stopped reading long before voting. The list is also super ethno centric, which makes me more dubious still about the claims for "best" anything.
According to the NYT[1], between 1950 and 2018 95% of published English-language fiction authors were white. That Top 100 Novel list contains at least 3 black authors, Ellison, Wright, and Baldwin. Considering that the percentage of black authors for the period 1900-2000 was probably even less than for 1950-2000, and that there are actually only 75 unique authors in that list, on its face I don't see the bias by the voters. The bias is in the disproportionate share of published white authors.
Many of the best things in life are hard. And you wouldn't necessarily recommend them to a friend.
When you consider specific domains, often the best instances of X tend to be harder versions of X. Or, when people become familiar with many instances of X they seek out the "best" instances of X. Its natural that those best instances would be difficult for people unfamiliar with the domain.