Comment by cosmic_cheese

From my point of view, the ideal here is something like pre-OS-X Mac OS, where the OS itself was barely even an OS and more just a substrate just complete enough to run the desktop and third party applications on.

The majority of bells and whistles (which Windows Hello falls under) were not baked into the OS, but instead implemented as system extensions that the user could disable and prevent from loading into memory at will.

This meant that even with the last release of Classic Mac OS (9.2.x), if you disabled all extensions you got a desktop reminiscent of the 1985 System 1 except with color and modern resolution support.

I think it should be more of a goal for desktop OSes to try to emulate this. If a Windows user wants a quiet no-frills Win2000 like experience except with choice exceptions like Hello, they should be able to have that without having to resort to messy hacks that impact stability and undo themselves if you update.