boring tech take: it's a mistake that file names and directory names can be ambiguous
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really though if i have a path that should be a directory i always suffix it `/`. i don't have to guess when joining paths, and it finds weird concatenation bugs really often
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But it's fun for tools where a trailing / is significant. Like at least rsync...
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rsync greatly appreciates the effort to be unambigious and will reward you by cleaning up all the mess in your home directory because you did `rsync -r --delete user@host:foo/ ~` instead of `rsync -r --delete user@host:foo ~`.
... and that's why, beyond backups, I compulsively use --dry-run and implement it in my shell-scripts. Backups are for when something screws up anyway (like old opam install!)