The only two reasons why printing web pages out is lousy are because web developers put little to no effort into it, and because the browser manufacturers put little to no effort into it. I would love the likes of WeasyPrint and Prince to be rendered obsolete by one or more mainstream web browsers. If any of them decided that it was a strategic priority, they’d get a lot done very quickly. It’s just that there’s no compelling reason for them to, while there is for the people behind engines with a specific purpose—and so Prince is pretty safe in its position.