Your post somewhat brought to mind those "aggregator" sites that were popular 10-12 years ago where individuals would "curate" web content onto related collections of content, perhaps centered around their hobbies, a sport, cooking or whatever mattered to them.
In a sense, it was an extension of the circa 2000's notion of "blog rings" that connected related/similar blogs within a frame and took people from blog to blog with a single click.
In a sense, I was happy when PeakD added their CCC - Curated collections — feature as a way to present/reblog groups of content. Except... they serve as testament to how few people actually read/look at content because they very seldom actually help the featured creators.
And it also serves as an illustration of your point that decentralization can be a disadvantage. "Curated Collections" only look good if you're using PeakD... elsewhere, it's an ugly muddle of links. So individual reblogging actually is more effective...
Perhaps...