[jimjimjim]

Different use cases.

"without text overflowing" brings with it a lot of detail. In pdf every letter/character/glyph of text can have an exact x,y position on the page (or off the page sometimes). This allows for precise positioning of content regardless of what else is going on. It is up to the application that writes the pdf to position things correctly and implement letter or word wrapping.

XPS was the closest to reimplementing PDF but microsoft didn't get enough buy in from other parties so it quietly died.