> Real world is often more complex.

Which is why you architect before-hand with a paradigm of your choice, like DDD (Domain Driven Design) using proper contexts (which Phoenix supports) beforehand. That is the sign of a mature developer, not the other way around.

If your datatype for a column evolves over time to completely different types, it's just an excuse for poor planning and architecture. Eg. A string turning into an integer. That just sounds like someone junior would do with MongoDb.

> You really sound like someone who only does CRUD services.

You throw this like an insult, but in reality most applications can be simplified to just CRUD services. Chat interfaces? CRUD. Social Media? CRUD. Banking? CRUD.