My life is this in django. Querysets have been passed around everywhere and we've grown to 50 teams. Now, faced with ever slower dev velocity due to intertwined logic, and reduced system performance with often wildly non performant data access patterns, we have spent two years trying to untangle our knot of data access, leading to a six month push requiring disruption to 80% of team's roadmaps to refactor to get the ORM objects not passed around, but to use plain types or DTOs, which will only then allow us to migrate a core part of our database which is required for both product development and scaling needs.

Here's the thing. In five of six companies I have worked at, this story is the exact same. Python, Ruby, Elixir. Passing around ORM objects and getting boundaries mixed leading to more interdependencies and slower velocities and poor performance until a huge push is required to fix it all.

Querysets within a domain seems fine, but when you grow, domains get redefined. Defining good boundaries is important. And requires effort to maintain.