It's clear that here using monospaced font is an artistic decision here.
Furthermore, using system-ui for anything that's prose and not a UI is an anti-pattern that UI designers love to make. It also makes the font dependent on system language, which makes things worse if the system language doesn't match the language of the page. https://infinnie.github.io/images/blog/bootstrap.png Even hardcoding it to something classic like Verdana (remember web safe fonts?) is much better.
Furthermore, using system-ui for anything that's prose and not a UI is an anti-pattern that UI designers love to make. It also makes the font dependent on system language, which makes things worse if the system language doesn't match the language of the page. https://infinnie.github.io/images/blog/bootstrap.png Even hardcoding it to something classic like Verdana (remember web safe fonts?) is much better.