[ta1243]

Do you work in modern enterprise fleet management?

Linux is fine for an individual - I've used it for over 25 years no problem.

I have no idea if modern desktop configuration management and centralised identity like mdm/intune/sccm/ad even exist, let alone how well they work in the real world

Your mention of SteamOS suggests that you don't understand the considerations governments and enterprises have in fleet management, but maybe I'm misunderstanding your statement.