I'm not sure how that confers much useful information about a user.
Ideally the blocked list would be viewable.
I think it's important if you believe Twitter is 'the town square', people should be able to see who and who isn't allowed to enter that town square to respond.
There are a lot of reasons a person may choose to block another account, from harassment to simply curating a better experience for themselves.
> people should be able to see who and who isn't allowed to enter that town square to respond.
Do you use Twitter? This isn't how Twitter works at all. The fact that a person blocks you doesn't prevent you from entering the "Town Square" in any way.
This is a strange kind of town square.
First of all, it has to protect wealthy elites, emperors, and so on, in a society with appalling wealth inequality. All people who would be unable to enter a town square without elite soldiers / praetorian guard / varangian guard to protect them.
Secondly, this town square is not a public space, it's the wholly owned private property of a collection of ultra-wealthy people and institutions (or a single wealthy individual, who may as well be Caligula at this point).
Finally, the town square already isn't a great model: there were town squares during the reign of Caligula, the entire institution of serfdom, during slavery in the American colonies, during Jim Crow. What was discussed there? Whose "free speech" was protected there?