This. Many readers enjoy gaining multiple perspectives on the same news story from which to draw their own conclusions. This behaviour is scarcely catered for today.
Going back to pre Internet: Even then most people got one newspaper and be done. (I myself grew up with in a household with a daily newspaper and two weekly, in addition to subscriptions to physics and computing magazines, but that was an exception, in most of my friend's places there was at most one) And TV channels there was one news program one watched (and still only few people switch between news channels)
I think most people get very shallow news information from some big names (nu.nl) that are basically reprints from AP news items. Short discription what happened, no background, nor deep diving. Most websites have the same reprinted stories, nothing worth paying for.
For background stories, that require real journalism, you can't rely on just one source. You want the best articles from all sources. Most sources have only a few good deep stories a month.
But things have really changed compared to pre-internet: it is much easier to share links to specific news items, and all these links are actually within reach, just click on the link and open it.
This is the sea-change that has happened. Newspapers used to be hugely profitable, because they owned and controlled the primary source of news for most people. Their platform – direct distribution directly to people's homes – was immensely powerful for many decades. That platform was disrupted by the internet. Newspapers are no longer the primary platform most people use for media consumption. Those platforms are now, as you say, places like HN, Facebook, Flipboard, Google, etc.
If you go to a facebook stream: how.many different news sites do you really get? - It's few. Most your "friends" have their go-to media they share and random outliers. It feels broad, but I doubt it's broad for the typical user.
I don’t think this is a good thing. We’d all benefit from seeing multiple perspectives on the news. But to solve this problem you’re going to have to persuade companies that have no interest in sharing their audience and convince an audience that, by and large, doesn’t have a big interest in reading multiple sources of news. It wouldn’t be easy.