It also just happens to be a number that you can see at a glance. I really don’t follow that whole scan path idea to well - and I mean, both as an idea, and as an actual practice. I tend to grok 75-100% of each line at a swipe, with longer pauses between Eh - maybe that’s why many people don’t find reading so enjoyable. That scan path sure makes it look like they’re working overtime!
My biggest gripe, by far, is developers pinning sidebars to fixed positions, so that when I expand the page, they stay put. and obscure the article or picture I was trying to see. It’s a dumb. There’s really nobody on this planet who is so very interesting that I will put up with that for long. There is only just so much blam and pow and clickbait I will countenance. And the smaller the screen real estate I’m looking at? The less of this kind of stuff I will put up with. When it becomes annoying enough? I will begin to dislike whoever and whatever all that junk refers to. So, a developer can easily mess with someone else’s street cred and business by being dumb about this.
But I did like the suggestion on spacing and font groupings! Sooo much nicer to read.