Pixels vs. Relative Units in CSS
“Remember, users really do change their settings under the hood, and we should be maintaining users’ control over their own browsing experience. If you use relative CSS units for your typography styles, you can maintain the fidelity of your layouts without negatively impacting the needs of your users.”
A good reminder that relative units still matter, quite a bit. And as a user who's starting to up the base font size as I age, I'm noticing these things.