I rarely read paper, but I find professionally designed documents much easier to read on my screens. It's such a relief to open a PDF of a professionally designed book, for example, after reading screenfuls of html.
I can prepare a decent looking document, or spreadsheet, with LibreOffice styles (CSS) without particular effort. With Docs should not be much different.
Have seen official government Word documents with formatting in need of assistance. Teams at very large firms share Word documents, via email, forth and back debating about revisions of text and numbers. Publishing was only the necessary last step.
In most cases authors use the bare minimum of functions to get the job done. Professional looking is something else instead. I don’t know where Docs stands here.