The quote above does a great job explaining how imperative your font choices are on the overall look and feel of the website. If you get too carried away with aesthetics than you can add too much excitement to a page or the opposite effect, confusion, either way it is preventing your reader from actually being able to take in the information because of a "visual disconnect" or a design overload. Just how you can walk into a clothing store and get easily overwhelmed because it has too many trends going on at once and it's too crowded with too many different kinds of looks that you'll walk out, the same can be applied to a website. If your choice of font(s) are too much and are causing a visual disconnect, then your audience will leave before they even got a chance to read the information to retain anything from the website. It might also cause them to not want to return to the site because of some visual disconnect PTSD. In simple terms, less is more and make sure it's cohesive with the overall tone of the company.