I just want to be able to drag taskbar items around in the taskbar like I can with Chrome tabs.

7+ Taskbar Tweaker lets you do this in Windows 10, even breaking out of window groups. XFCE lets you do it out of the box. XFCE does also let you drag files to the taskbar item to activate that window, which I do occasionally. I already switched to Manjaro everywhere for work though, so Microsoft can do whatever they want. Windows machines are just for games and watching streams in my house.