I wonder if you've ever worked on a Hibernate project that's more than a couple years old. Once you exhaust the limits of what the ORM author deemed important

I wonder if you've ever worked on a Hibernate project that's more than a couple years old. Once you exhaust the limits of what the ORM author deemed important (or within their ability to adequately deal with), you are left needing deep knowledge in both the ORM and SQL to debug/optimize. Also, SQL knowledge transfer well between different engines. ORMs tend to be unique snowflakes with very few common patterns beyond the impedance mismatch that is object-relational mapping.