They've missed the liberal use of dependency injection, triggers, or anything that can create a side effect of an event without being documented in the function

They've missed the liberal use of dependency injection, triggers, or anything that can create a side effect of an event without being documented in the function being executed. Much fun to be had there. Even just setting up PostgreSQL partition tables can defeat the most diligent maintainer (as they suddenly find RETURNING id_column fails everywhere).