From talking to most customers they actually find phone updates annoying as it 'breaks stuff'.
Because it's true, whether "breaks" means, changes the UI, or removes a feature that I need, makes an installed application stop working, or (with Google) removes an entire on-line service with little warning.
Regular end-users, who lack the skills to ferret out fixes and workarounds on the Internet, are justifiably afraid of updates.
(My Mint box being the exception. Somehow they manage updates without breaking stuff.)