I think it's a very tiny number of user though. Most users don't care about a security update and many actively avoid them. A phone updating all the time is seen by many to be a bug, not a feature. If my car was constantly nagging me to take it into the shop to be optimized, I'd be pretty annoyed. If it was taking itself to the shop and coming back telling me I now needed to update my seat belts in order to work with it's newest updates I'd be further annoyed.

I switched from iPhone to Android because I end up breaking my phones after about two years and I can't be paying more per annum for a phone than for a car. I need an email client, web client, maps and sometimes a camera for taking a reference photo. It's astounding to me that the cost of meeting those needs seems to be increasing over time instead of decreasing.

We've seen over time how Apple uses software updates to aggressively force new hardware purchases. The latest OS doesn't support version X of the software, and more often than not your device doesn't support OS version Z so open up thy wallet and get the latest hardware. This is precisely the reason people are terrified of updating their software. It goes from working to not working. This impacts my reasoning for NOT buying Apple hardware.

EDIT: You know what, I change my mind. This gains some respect from me for Apple. I hate phones in general and I'm just grumpy.