Synchronous Multimaster Replication

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Page: https://www.postgresql.org/docs/11/different-replication-solutions.html
Description:

Not sure if this is an error but I was wondering about this sentence: "In
fact, write performance is often worse than that of a single server". Isn't
syncronous multimaster write performance always (rather than "often") worse
than that of a single (non-distributed) server?
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