AI can’t take away babies, picnics with your spouse, or dipping your toes into the ocean. If it replaces work, then great, that’s the stuff we didn’t need to do anyway.
They also don't have clean drinking water or food that wasn't prepared on the ground. They don't have modern medicines or 'modern' entertainment like cinemas.
OK, but by hypothesis the AIs are in control. Now suppose they want to switch to a more efficient kind of data center that would corrode quickly in the presence of oxygen, so they remove all the oxygen from the atmosphere.
Or they disassemble the rocky planets to make a Dyson sphere.
I do it because I believe humans have a moral obligation to power the various cogs of society. If humans are no longer needed to power said cogs, then I no longer need to do it.