I tried to search online on whether or not font should adapt with the size of the window and I found a lot of results on how to do it but not many whether I should ever do it. I tested it on multiple sites (this one included) by changing the size of the window and it seems like most websites don't ever change font size.
This doesn't make sense to me at all, since the same font will display as larger or smaller, depending on the resolution of the screen - in other words, I want to know why fonts seem to always be defined in terms of pixels (rem uses pixels as well, just indirectly), no matter how big that pixel is physically on the screen, instead of scaling relative to the size of the page. But I also just started learning Web Design, so I'd rather assume there is something I don't understand rather than everyone else is wrong.
Should the font size ever change depending on the size of the screen? If so, then when? Should the font be fully adaptive (like with clamp and vw) or is it better to hand-pick font sizes for specific CSS breakpoints?