Same with fonts, and colors, and text size, and scroll behavior, and on and on. Back when dinosaurs roamed the earth, web sites published hyperTEXT and the user agent (browser) operating on behalf of the user, rendered the page according to the user's preferences. I remember how cool it was to configure it so every web site rendered in white text over a brick wall background! Slowly browsers added HTML tag after tag and CSS to give more and more layout and visual control over to the web site publisher and less to the user. Today, stylistic user preferences are a relic of the past, as browsers have given everything away to the publisher.

I agree it's wishful thinking. Sadly, web publishers have gotten used to all this control and expect the browser to be some kind of pixel-perfect renderer like Photoshop, and there's no push from end users to have this kind of user configurability anymore.