I think what OP's saying is that on the Amiga it was idiomatic to let the UI be handled by a dedicated thread/task. That was also the norm on other notable sys

I think what OP's saying is that on the Amiga it was idiomatic to let the UI be handled by a dedicated thread/task. That was also the norm on other notable systems such as BeOS. It's still a good guideline today but not so easy to apply.