About UI, it is not necessary that it should be heavy and bloated. Lazarus IDE, for instance, produces very small binaries even for fairly sophisticated UIs and it is quite fast.
Can I, really? How does one framebuffer in a couple of lines of C? Show me a simple program that draws a black 800x600 window.
> you will likely end up re-implementing widgets in any case, if your app gets more sophisticated.
Don't worry about that. My "app" won't get more sophisticated. I will never ever need any widgets nor drawing directives. Just give me a framebuffer and key/pointer events.
It seems to me that we are adding a lot of complexity and going backwards feature-wise.
[1] http://freeglut.sourceforge.net/ [2] https://www.glfw.org/