For fifteen years Doctrine shaped how we write entities, and not always for the better. Entities could not be final, because proxies had to extend them. Every field grew a getter and a setter. Money, addresses and identifiers ended up as strings and floats, because mapping anything richer cost more than it was worth. None of that was a design decision. They were workarounds for things PHP could not express.

It can now: attributes, backed enums, property hooks, asymmetric visibility, native lazy objects, arbitrary-precision numbers in core. Doctrine ORM 3.4 and DBAL 4.3 pick all of it up, and ORM 4 is built on it.

We take one realistic entity, too many accessors and primitives, and refactor it live on the slides: final classes, no setters, typed identifiers, embedded value objects, self-registering DBAL types. Same schema. No migration. Considerably less code.