There are 2 contents with this tag:
Why designers should move from px to rem - and how to do that in Figma
If you're a Web developer (as most of my readers), you already know that users DO change font size (in their browser preferences), so you make sure to use proportional dimension units (em, rem, %, etc.) instead of px everywhere you can.
Font sizing with rem could be avoided
I don't really agree with the simple statement made in the title of this article, as sizing fonts with rem is sometimes useful to escape the default cascading sizing, but the most important part here IMHO is the following:
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Christine Vallaure
Harry Roberts