Maybe the audience of FOSS is "self" and therefore I will obviously write something that matches my need.

Can you provide one example ?

because gnome is FOSS and I have heard complaint it's 'too simple'

and https://birchtree.me/blog/screwing-up-the-simplicity-of-it-a... : "Most people get maybe 2% of the potential of their Macs and Windows PCs today. Have you watched most people use a computer laterly? Most people I see have all apps in full screen all the time, no matter how big their screen is. Most people I see use keyboard shortcuts for copy and paste, opening new tabs, but basically nothing else. I've seen numer ous Mac users download apps, open the DMG, and run the app from the DMG forever because they don't know you should move it to the Applications folder. Many people have a desktop full of files because the desktop is the file system."

(and SAP and any Oracle Enterprise products...)