You're right that fzf doesn't replace find. Fzf is just an interactive, filtering tool. You can pipe anything into it. find is a common way of populating it with data.

I suspect the GP meant that fzf replaced the pattern 'find |xargs $binary' for small interactive use cases. It's much nicer to do '$binary <invoke fzf>'. I use fzf the same way with key bindings to select directories and files powered by find.

It's not a find replacement at all, even!

fzf just actually calls find by default, so a naked call to fzf will actually give you the same results as find | fzf.

Search specifically for directories, that's find -type d | fzf.