One practical reason - system stability for important events.

I travel for work, and often have a tech demo, solution, tool, or something to show - or am running a workshop.

I usually do NOT update things right before my trip, as I want to minimize the potential for disruption.

> My browser doesnt update automatically, i have to approve it.

Have you ever actually blocked it due to something in the new version, or is it mostly to control the timing of when it updates?

For example, Firefox updates by default and forces you to restart it, disabling using websites or seeing any site content before doing so.

Being able to turn auto-updates off is okay, but that being the default would certainly not be okay in Codex, giving the reach, what it can do and how immature it is.