I liked Gnome Shell but I have large dual monitor systems and run multiple copies of the same apps. The least worst way of dealing with those has been a taskbar. I tried to use extensions but they broke on every new release as well as having random quirks, so I gave up and use the the legacy mode. I'm hoping the new classic mode actually works well. Example issues I've found before are being unable to reorder taskbar buttons, not bringing apps to the foreground when hovering over their buttons during a drag and drop, not having a usable system monitor (I have no need to sort through 3 pages of candidates on a website) and hiding the message area.