Comment 4 for bug 956207

To add to what Conscious User said, every program(mer) has his or her own ideas about fonts and font sizes, it seems. So while yes, setting the font size globally makes sense, it doesn't address the problem on an individual program's basis.

One good example of this problem in action is Nix Note. Cutting and pasting notes into Nix Note produces a mix mash of fonts and sizes. So size adjustment has to be made on the fly, sometimes note by note.