Taxing Postgres is one thing, which can be overcome with ways like using standbys. There could other more native ways (than unifying storage), which you’ll hear about in a few weeks. Also I don’t fully agree on logical replication taxing Postgres, if the client is built with care and precision.

In regards to error prone and speed (lag, latency at real-world scale), I wish the blog went into more detail and gave evidence than talk theory.