I wish there was more done in CSS for generation of print documents.

I mean, precise sizing, pixel perfect placement, layouts, etc, that can be printed as PDF pages.

I know there are print related media settings, but they seem overly complex and paid libraries have cropped up, which abstract away the complexity, but charge to provide usability.

HTML & CSS, conceptually, are world class technologies. Separation of content and styling, theoretically, should be able to display / output documents for a wide variety of targets. However, media queries are based on screen pixel sizes. I don't know if its even possible, but I would love to define media for PDF documents, Word documents, etc.