Epub pushes the duty of layout onto the reader, it is very similar to a website. With epub you can freely change font, spacing, etc. (great accesibility feature

Epub pushes the duty of layout onto the reader, it is very similar to a website. With epub you can freely change font, spacing, etc. (great accesibility feature). PDF is a representation of paper. LaTeX files look good as a PDF because LaTeX files are created to be printed or viewed as a PDF. A digital book should not enforce layout. Yes, epub has flaws, especially if it is not seen as the main target for publication.