> it really just requires no "split brain" is possible. For example, "consensus" is achieved by making one server the leader, and giving other servers no say.

Which is funny, because that actually describes political consensus as well, functionally, even if it’s not what people typically think of as the definition.

If you can effect enough of the right censorship or silencing or cancelling, you can achieve consensus (aka no split brain, at least no split with agency)