I have a monitor with a fairly high DPI which makes all of the UI and HUD quite small. The chat size option helps a bit with the chat, but nothing else, including the status bar.
It'd be cool if there was a way to just have an option to adjust the UI scale. I've noticed the main menu and loading bar but not the loading bar text actually scales based on resolution, but nothing else seems to.
Another issue is the outline on the chat text gets very thin at large sizes so it doesn't work very well to create contrast against a bright background.