Summary of "Casey Muratori on Code Structure and Organization"

Core thesis

Object-oriented programming (OOP) often pushes programmers to spend more time on code organization, which can be valuable — but that organization can be misguided when OOP concepts are misapplied. The organizational habits learned with OOP transfer to procedural programming and can improve how you structure code even without classes.

Why people favor inheritance / OOP

Many programmers learn OOP after basic procedural work. OOP supplies a ready-made way to structure code (for example, inheritance hierarchies), even if that structure is not optimal.
Because OOP produces visible organization, developers adopt and retain those habits.

Problems with overusing OOP

Reflexive use of inheritance hierarchies and virtual dispatch can produce poor designs.
Treating OOP rules as dogma (“do it because a book says so”) leads to unnecessary complexity and indirection.

Procedural alternative and practical guidance

Procedural code can be as well organized as OOP code. Encapsulation and separation of concerns are achievable with plain structs plus external functions.
You can practically encapsulate behavior by restricting functions to operate on a specific struct, without needing member methods or virtual dispatch.
If a behavior truly belongs tightly to a data type, it is acceptable in procedural code to keep that behavior “tightly coupled” (e.g., dedicated functions for the struct).
To break bad OOP habits, stop automatically thinking “associate this behavior with that object” and instead ask whether the behavior should operate across multiple data pieces. Unlearning is mainly about changing your mental framing.

Takeaway / best practice

Keep the useful parts of OOP (organization, encapsulation) but don’t treat OOP as a strict rulebook.
Use straightforward procedural decomposition when it leads to simpler, clearer code; avoid unnecessary inheritance and virtualization.
Adopt whatever organizational form makes the code simpler and clearer, not what is merely fashionable.