To be fair: they titled it "20 mystical bridges that will transport you to another world." Which Maillart will never do. He was a poured concrete dude, and Swiss besides. You titled it "20 beautiful bridges". I checked it on my phone and didn't look at the title they used. You're right - by their criteria, Maillart doesn't belong. But I still insist that Maillart's actual bridges are more beautiful than these. These bridges are largely mundane. And they're all footbridges.
I'm old fashioned so I like footbridges, but I still would never associate 'lack of technical proficiency' with 'mundane'. Also -- disclosure! -- I liked the list because I've crossed one of the bridges. I saw a large bridge this weekend, crossing the Rio Grande west of Taos. Nothing extra-special about it, but any well-made bridge that spans a thousand foot deep canyon is pretty damn cool.