That’s why – despite being a free software advocate – I currently run Windows for all critical software, as on Windows I can scale content without re-scaling windows. (Qt and Android support it as well, but Gnome and macOS don’t).
Yes, but Elementary, Android, Windows and Qt can scale icons and all elements together with the text to any arbitrary scale, pixel-perfect, without any post-processing.
GTK can only scale text, or scale the whole window to 2x, 3x, etc and then scale it back down in post-processing.