[gryn]

different devs have done through history different methods implementing this. the real answer is context depend, who's the target audience and what do they want out of that progress bar.

you can have a progress bar that show the milestones + ETA. multiple progress bar + log messages box that shows what the background is doing, or you can just have single disconnected bar that's based on a timer based on what you estimated the task would take etc.

as user: - how do you know if the UI / process is stuck then or just taking ? - how much time is there left, you got other things to do after 5 more tasks like the current one and want to estimate a rough estimate when you'll be done with this.