So every person who reads Dan's blog and finds the layout too dense, they should write and maintain a stylesheet for his site?
And every person globally should do this as well for any other website that doesn't have a good default reading experience?
CSS is explicitly designed for you to apply your own user stylesheet. That is exactly what it envisions you doing. If you don't like web technologies you might want to question what you are doing on the web. However, the web also encourages sharing, so no, theoretically once one user has created a user stylesheet they would share it with others so there would be no need for everyone to create their own, unless they had alternative tastes.
Actions speak louder than words.
I mean, if it really bothers you you could fairly trivially apply picocss or whatever to it using a user stylesheet. That is so little effort that calling it working for free would be disingenuous to say the least.
If most readers of danluu don’t find that, then yes!