@douginamug
I've been using Nautilus' treeview feature for decades, it's super useful!
Unfortunately, since the GTK4 port it's been very buggy with file move/copy operations, as it has some nasty heisenbugs that cause visual duplication of items. I wish I could find someone to fix those: https://gitlab.gnome.org/GNOME/nautilus/-/issues/?search=expand&label_name=5.+View%3A+List