While I mostly agree with Jay Kreps, I believe that the upfront costs of event sourcing systems are way higher than traditional ones. Kafka itself seems to hav

While I mostly agree with Jay Kreps, I believe that the upfront costs of event sourcing systems are way higher than traditional ones. Kafka itself seems to have minimum hardware requirements way above something like a single-node Mongo or Postgres installation, let alone the infrastructure to create projections.