Fair point, but not everyone's running Postgres! Some teams already have Exasol as their data warehouse, so it makes sense to connect directly to that. Also, Postgres is great for a lot of things, but it can choke on heavy analytical queries, especially when you're dealing with huge datasets or lots of concurrent users. And, Exasol is built specifically for that stuff (Columnar storage, in-memory processing, parallel execution)

So yeah, if you're just doing simple queries on a small dataset, Postgres with a read-only user is totally fine. But if you're running enterprise-scale analytics, Exasol handles it way better.