[xenadu02]

You can always route writes to a writer node with streaming WAL replication to all the reader nodes. Works for some workloads and systems, not for others.

For that matter if you write your system with the correct abstraction you can switch to Postgres _later_ if it becomes necessary. For every system that really did need to scale 10,000 are pointlessly overbuilt - worrying about scale when it just didn't matter.