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Being able to pin a feed to my homepage without following everyone on the list is a genuinely useful and awesome feature. Google+ was ahead of its time with circles (IYKYK) but this is the next best thing for curating multiple feeds.

It's a great feature but you can actually do the same on X. The issue is that X has so many different features baked into it at this point that it's difficult to remember them all. Fewer, discoverable features creates a better overall UX.

I use communities for this on X which is slightly different but it pins community feeds to my home screen. Maybe slightly different to what you're looking for but it's essentially a feed of posts relating to a specific topic - without having to follow anyone. Eg. Here's Apple in my X homepage:

Wait, I thought that was basically subreddit? Like the content within is novel and not just curated from the main network?