It's less of a difference than you might suspect. The personalized curation is in which forum you choose to visit. HN is quite niche by numbers; it's a lot smaller than say bodybuilding.com or even AR15.com. That you choose to go to news.ycombinator.com is your personalization, and also skews your view on the world. Most of the world is interested in very different stuff.
Isn't that the whole point? That I have chosen to visit that and personalize? Otherwise, you could say all personalization skews the worldview, and you'd be technically right (the worst kind of right).