This is exactly the problem that I'm getting at. The reason your font is getting smaller with higher pixel densities is because the font size is being tied to t

This is exactly the problem that I'm getting at. The reason your font is getting smaller with higher pixel densities is because the font size is being tied to the pixel density. In a better native world, your font size would be completely unrelated from the monitor(s) you're using. It is the attempt to tie font sizes to physical attributes of your monitors like their resolution that is giving you this problem. And it is the need for scaling to be based on resolution that makes multi-resolution monitor setups break. There's no reason why your OS couldn't size text differently on each monitor based on monitor-specific settings that you control, and there's no reason why the applications you're using couldn't implement responsive design and accommodate that setup. As designers we would just need to embrace responsive design and stop trying to control everything.