> but for technical tools it can be pragmatic

I've thoroughly enjoyed using ImGui for tooling around image processing, computational geometry, a bunch of 3D projection stuff. The fact that it's based on OpenGL or Vulkan or whatever backend you want is a big win for this kind of work. I can just take a bunch of pixels, throw them into a texture, and render some quads with those textures painted on them after going through some 2D transformations or 3D projection/transformation. It's quite beautiful for all of this. ImPlot for doing basic data plotting and the built-in ImGui widgets for controlling the whole thing.