Longer lines of text are harder to read. There's a reason newspapers, books, articles, etc are all vertical and often have a similar amount of words per line. It's easier to follow, scan, and find your place.

Some more on this below:

Optimal Line Length in Reading — A Literature Review (https://journals.uc.edu/index.php/vl/article/view/5765)

Practical Typography — Line Length (https://practicaltypography.com/line-length.html)