Sitting on a 21:9 monitor (and a second screen) here so I might be biased but we generally have way more horizontal screen real estate than vertical one. Human eye viewing angles tell an even more convincing story. Reading long lines of text is a pain in the neck, true.
Somehow I do not hate the image you posted. I guess it’s a matter of preference. Some things would be very awkward in vertical, no? Like a big split struct. How would you do this with a vertical setup and maintain reasonable readability:
One thing I immediately dislike about the vertical setup is the way text is handled; text does flow horizontally. Unless it’s old-school Japanese, that is.
Also, you can wrap things in macros, functions (that’s a poor excuse to use a function, I know) and even collapse groups of nodes, group things with comments.
I wonder if Epic considered an alternative like this when designing blueprints.