Yeah, ultimately how good the code is (or even how buggy the resulting product) is just a side-effect and not the main goal. Fortnite is making so much money that having to spend 2x as much on engineering because the code is a mess is business wise just not that big of a deal.

Somewhat (obviously to within reason) decoupling design decision from what would be easy/convenient for the developers to implement is often the right thing to do from a business point of view.