>I can curate a stream of content that is almost always relevant to my interests

How much work did that take you?

I've tried to do what you describe.... but time and again I grow tired scrolling through hordes of "I really followed this person or thing to hear about this content but now they're tweeting about X" and found I constantly had to manage it. It was to the point that I just would rather keep bookmarks as websites are better at staying focused than most twitter accounts.