Back when I worked properly on big games the UI libs would often be trees of widgets with injectable functions for modifying the rendering, which is actually one of the points in this blog the writer would like. (The UI lib of classic Sims was exactly like that). These days the stuff I've done, although entirely in JS, at https://luduxia.com/ follows that pattern for the 3D components at least. The world is defined in an almost classic scene graph and then behaviour is added by attaching functions to pieces, which can be composed functionally.

Much of the anti-OOP noise is the result of people that have suffered from others creating hierarchies of the world too literally. Quite why it proves so difficult for developers to slow down and think about the right course of action is beyond me. They're also staggeringly resistant to changing afterwards.

There's a reason Simula was the first OOP language.

https://en.m.wikipedia.org/wiki/Simula