> can have online discussion without moderation
That's a big negatory.
>you publish on your site,
And your site gets a takedown for illegal content, or cops show up at your door and drag you out while beating you.
Life is heavily moderated in a million different ways. What we're talking about this point is just moderation or unjust moderation.
It’s hard to take down sites on Tor. Usually impossible without the full weight of the FBI/CIA. I agree with the user above: we can do decentralised communication without censorship. Of course if you start from the faulty premise that online discourse needs to occur on one of a handful of censored platforms then that’s impossible.