It's gotten significantly worse over time. Are there better alternatives that collate news, by topic, from multiple sources?

Newsvoice was an app that tried to crowdsource that job instead of using algorithms. It very quickly became an alt-right cesspool, presumably because those are the same people who feel disenfranchised by FAKE NEWS LIBERAL MEDIA and so flock to alternative communities.

I just use Feedly and select sources that I trust. There's no other way to do it.

I do not see that as a problem. Most news media is at least to some extent propaganda and basically all of it is biased. At the end of the day, if I want truth then I have to evaluate each bit of news media for its credibility whether it comes from state funded propaganda or from some supposedly impartial organization. So what I want from an aggregator is to just show me relevant content without trying to sort it by credibility. I trust myself to sort news media by credibility much more than I trust any aggregator to sort it for me.

Yes, the utility of an aggregator is not to show you correctness, but to help you survey the landscape of narratives and trajectories.

The utility of looking at multiple similar voices is to get a sense of the scale of a story, and inter-rater reliability; otherwise you have a portfolio of unweighted novelties.