Like most things we need both in balance – totally open linking and personally (contextually) filtered channels. Clearly our personal filters need to be known to us personally …. or they are impersonal filters. So now you know, if you didn’t already.
The idea that it inhibits active dissent seems entirely spurious. Criticism is all too easy. Anyone wanting to dissent actively needs active intent to get off their ass, not find dissent opportunities on a plate. That’s a good reason for filtering.