That article is wrong on several levels and the author just doesn't seem to understand what is going on. The whole part about how to set up windows is him not understanding that he's working with a retained mode scene graph - something the documentation[0] makes that clear.

Ironically you are more likely to see such an approach in modern GUI toolkits than when EFL was written.

[0] https://docs.tizen.org/application/native/guides/ui/efl/grap...