I think the worst change with Win11's taskbar is that it _always_ groups multiple windows of the same program behind one icon on the taskbar. So previously you

I think the worst change with Win11's taskbar is that it _always_ groups multiple windows of the same program behind one icon on the taskbar. So previously you had two+ taskbar items and could easily click on the one you want, now you must click the icon, a menu comes up showing the windows, then click on a window. If you're used to using the taskbar for quick switching like that it's a jarring change.