A long-standing frustration for me is that I always felt like it was really easy to make a responsive layout with Swing (I know desktop apps don't deal with quite the gamut of weird aspect ratios that websites do, but for the apps I built users typically tiled them and resized them between portrait/landscape and various sizes based on need and if they were actively using them or just passively monitoring them. So a lot of the considerations felt very similar compared to modern web design), whereas in CSS it's such a struggle comparatively (though flexbox and css grid and several other similar things have improved it a lot).

Now that, compared to godot, godot feels a lot more like the productivity/design experience I got out of Swing and friends.