I never trust progress bars which don't have a counter of some sort. Because most of them aren't connected to the background tasks or simply show the same animation over and over. For me they NEVER were interpretable as "yes I'm still working, don't worry" sensors. Had it way too often, that I had to kill a process after minutes or hours or even days because they didn't do anything anymore, but the progressbar was still running as if. Progressbars which don't count a real thing are always a scam, you can never see if the program still is working based on them. I don't get why people would think they do.