This is actually why I serve soup on a plate. Only my guests know what bowls they like, and they can pour the soup into a bowl of their choice.

Why should the designer design. Brilliant.

> Why should the designer pick how wide you want the text? You are the one who knows what you like, and you can resize the browser window.

Along with all the other answers here, given that this is a Rails adjacent I would say Convention Over Configuration.

I like a basic text oriented page myself but sensible defaults would be useful. If the user wants to override the CSS in their browser they can do.

Do you resize the browser window differently for each website you visit?

I want my text no wider than 80 characters, but I like the images to be potentially much wider than that. What is your solution?

Because the designer of today needs to wear the hat of yesteryear's typesetter (among many other hats)?