You say that someone has to think about it. But do they?
When I'm suffering from decision fatigue and I have to make a decision on something I don't find too valuable (where to eat), I'll literally flip a coin or use a random generator.
It offloads the burden tremendously.
The issue the author has is not that the burden isn't being shared. It's that the values are different. I don't know about her, but I've met people for whom flipping a coin is not an acceptable answer - because they care, and they don't want a flippant method of deciding.
The conflict is that one side cares and the other doesn't.
And part of the problem is that not everyone takes ownership of the issues they care about. If you care about a lot of things, then yes, you will feel the burden.
I like a clean house. It makes me feel much better than an untidy house. But I also feel that burden of cleaning, and the burden is worse than the feeling I get in an untidy house. So I keep it tidy enough such that there is a balance. Not too overburdened, and not too untidy.
In my experience, most people do not understand this tradeoff. They'll have high standards, but will not to bear the burden of those standards, and will be impatient with everyone who has lower standards.