I hadn’t planned on adding a separate font size adjustment, instead of whole-app zooming, though that may change.
My feeling on this is: If the font size is too small by default, it’s going to be too small everywhere: in application panels, in dialogs, in tooltips, and so on.
I can increase font sizes, but either UI elements are going to increase in size to accommodate that (essentially what zooming does), or text will overflow those elements, which is awful.
Are you using a custom font with odd size metrics, so that it appears smaller than the default UI font?
Are you using a custom font in the editor, preview, or both? Which font?