Because adding a text is just a imgui::text("abc") function call. And a button is just an if(imgui::button("click me")) do_something() statement. There is no ot

Because adding a text is just a imgui::text("abc") function call. And a button is just an if(imgui::button("click me")) do_something() statement. There is no other language involved, no markup, no gui editor. Just direct code and highly hackable to make this extend to unexpected lengths.