On: Multithreaded toolkits: A failed dream? (2004)

[kllrnohj]

Every GUI toolkit already "bothers" by virtue of being single threaded. You never see a UI toolkit where this:

  btn.setText("hello")
  btn.setColor(BLACK)

might show a white-text "hello" for a single frame. If the UI toolkit was thread-safe, though, that would become a possibility.