The terminal-based file browser space is so filled today but for my part I love what vifm has done for the dual-pane midnight commander concept - it’s the same basic idea, uses (somewhat) vim-like bindings by default and is super extensible.

Additionally, at least for my use-case btrfs benefits me since it is less picky about drive sizes being the same and duplicating everything correctly - letting you essentially just throw additional storage at it as you acquire it.