Somewhat relevant: Chet Faliszek (ex-Valve) is currently posting videos about how the flat hierarchy works:

https://www.tiktok.com/@chetfaliszek/video/72814172402960335...

https://www.tiktok.com/@chetfaliszek/video/72814409728508593...

https://www.tiktok.com/@chetfaliszek/video/72814159128240653...