Comment by hirako2000

And that's the argument for serif. If you set sans serif the OS may pick one or another font, and that choice may change over time.

By publishing with serif you are guaranteed there will be a clearer distinction.

But txet is contxtual you can evn miss letres entrly yet be lgibl.

The over a hundred page long research paper makes conclusion off a practical study, not encumbered by intuitive clues that typically make us think serif lead to more legibility.