Things were heading in the right direction in the early 2000s. Browsers had default font sizes built in and everything else could be scaled with the font using

Things were heading in the right direction in the early 2000s. Browsers had default font sizes built in and everything else could be scaled with the font using the em unit. Then browsers made zoom increase the pixel size. That was it. They fucked it. To this day it's still broken. Now you get phones where the zoom in does something utterly useless and people still can't reliably set their own font size.