If the filter is in every participant’s individual hands, then: 1. if a person I am interesting in delivery to blocks me by mistake - I have an option to ask h

If the filter is in every participant’s individual hands, then: 1. if a person I am interesting in delivery to blocks me by mistake - I have an option to ask him to unblock me by other communication means. 2. if my opponent in a public discussion blocks me, other people can still see my arguments. Both these benefits are absent in a centralized blocking system, no? And I do not see any drawbacks, are there some?