I waffled on choosing 100-250 initially, thinking similarly as you for authors like Shakespeare, Freud, Nietzsche, etc.
But then I kind of thought, for most people, that is probably overkill. If you stick with just one text from each great author, 50 is still a huge variety relative I think to what was available to people in the past. More is great, but not necessary: there are plenty of other sources of depth in life beyond texts, and text doesn't work well for everyone either.
Fair enough. I'd say there are over 500 "worth reading" but I agree with you too that with 50 or fewer you can have enough. People used to re-read texts dozens of times and that may actually be better in some ways than the constant novelty.
But then I kind of thought, for most people, that is probably overkill. If you stick with just one text from each great author, 50 is still a huge variety relative I think to what was available to people in the past. More is great, but not necessary: there are plenty of other sources of depth in life beyond texts, and text doesn't work well for everyone either.