Hi -
That is correct, yes. As I said, printing a viewport that is in any shaded display mode will result in raster output. As with any raster image, the more pixels you have, the more details you will be able to see, and the bigger the file will get.
If you don’t need shaded features in the output, putting the viewport in Wireframe or any technical display mode will result in vector output and smaller files.
-wim