I thought I would post a link to this (https://www.linuxlinks.com/excellent-gtk-file-managers/) article in light of a recent Ubuntu thread. It presents 15 different file managers that can be used natively on GTK-based distros like Debian and Ubuntu. Several are more feature-rich than the Ubuntu default, Files, and appear to address some of the feature deficiencies identified by Buster.
Thanks for sharing, Fox. Looks interesting.