You need simplicity if you want to move fast. PostgreSQL can very well replace Kafka, Redis, Clickhouse and Elastic. And many successful companies are doing exactly that. Let's check out how.
PostgreSQL for Everything
An argument for simplicity: PostgreSQL can stand in for Kafka, Redis, ClickHouse, Elasticsearch and MongoDB, covering full-text search, JSON, queues and analytics, so small teams can run one database instead of five.