For most people, especially work computer/laptop users, making the update happen by default on restart or during sleep hours does a lot to keep the pc updated, because they would otherwise never do it themselves. There is a somewhat large minority of users who complain about such behaviour, but these are mostly people into computers anyways and can update their stuff anyways.
But the biggest gripe is the horrid implementation of the start menu power buttons in windows:
update and restart: mostly works as you would expect - updates and boots the pc
update and shutdown: updates the pc, and instead of leaving the pc in shutdown state, many times it just boots the pc again, working like update and restart
restart/shutdown without updating: non-insignificant chance of it doing the update anyways
For most people, especially work computer/laptop users, making the update happen by default on restart or during sleep hours does a lot to keep the pc updated, because they would otherwise never do it themselves. There is a somewhat large minority of users who complain about such behaviour, but these are mostly people into computers anyways and can update their stuff anyways.
But the biggest gripe is the horrid implementation of the start menu power buttons in windows: